[ { "sku": "6208-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6208LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 17.8, "fatigue_load_limit_kN": 1.24, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 366, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6208LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "A 40 mm shaft for 6208 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6208-RSR-NTN run faster than contact-seal 6208-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6208-2RS instead.", "The non-contact lip of 6208-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6208-RSR-NTN drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 40 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6208-RSR-NTN.", "NTN catalogues this low-friction non-contact seal as 6208LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 40 mm bore puts 6208 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6700 r/min the grease limiting speed for 6208 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 32.5 kN dynamic load rating (C) and 17.8 kN static (C0), 1.24 kN fatigue load limit Cu, 6208 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 366 g, 6208 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 40×80×18 mm envelope of 6208 gives a D/d ratio of 2.00 and 20.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 32.5/17.8 kN load ratings, 1.24 kN fatigue load limit Cu NTN lists the grease limiting speed at 6700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 366 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6208LLB on the 40×80×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6208 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6208-RSR-NTN bearing?", "a": "A 6208-RSR-NTN deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6200 compare with other series at the same 40 mm bore?", "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated." }, { "q": "Are 6208 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6208 uses the same ISO 15 envelope (40×80×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6208?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6208LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 40×80×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 6208 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6208LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6208-llb", "6208llb", "6208-RSR", "6208-rsr", "6208LLB", "6208-RSR-NTN" ], "locale_variants": {} }, { "sku": "6208-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6208ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 17.8, "fatigue_load_limit_kN": 1.24, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 366, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6208ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-ZZ-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 40 mm bore the 62xx light series is the workhorse section; its 80×18 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6208-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6208-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6208-ZZ-NTN.", "NTN catalogues the shielded version as 6208ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 40 mm bore puts 6208 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6700 r/min the grease limiting speed for 6208 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 32.5 kN dynamic load rating (C) and 17.8 kN static (C0), 1.24 kN fatigue load limit Cu, 6208 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 366 g, 6208 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 40×80×18 mm envelope of 6208 gives a D/d ratio of 2.00 and 20.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 32.5/17.8 kN load ratings, 1.24 kN fatigue load limit Cu NTN lists the grease limiting speed at 6700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 366 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6208ZZ on the 40×80×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6208 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6208 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6208-ZZ-NTN bearing?", "a": "A 6208-ZZ-NTN deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6208-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6208-ZZ-NTN need?", "a": "6208-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 6208?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6208ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 40×80×18 mm ISO 15 envelope." }, { "q": "Is 6208ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6208-zz", "6208zz", "6208-ZZ", "6208ZZ", "6208-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6308-NTN", "brand": "NTN", "manufacturer_designation": "6308", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45, "static_load_kN": 24, "fatigue_load_limit_kN": 1.83, "limiting_speed_rpm": 7800, "max_rpm": 7800, "weight_g": 630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6308-NTN.", "The 63xx medium section at 40 mm bore gains dynamic rating through larger rolling elements on a 90 mm OD; the penalty is mass and a lower limiting speed than the 6208 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6308-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6308 units.", "Never mix components between two 6308-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6308 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 40 mm bore puts 6308 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 7800 r/min the grease limiting speed for 6308 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6308 at 45 kN dynamic (C) and 24 kN static (C0), 1.83 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 630 g, 6308 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 40×90×23 mm envelope of 6308 gives a D/d ratio of 2.25 and 25.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 45/24 kN load ratings, 1.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 7800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 630 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6308 on the 40×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6308 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6308 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6308-NTN bearing?", "a": "A 6308-NTN deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6300 compare with other series at the same 40 mm bore?", "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6308 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6308 uses the same ISO 15 envelope (40×90×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6308?", "a": "NTN lists the open 6308 under the bare designation 6308; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 40 mm bore envelope." }, { "q": "Does NTN offer 6308 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6308 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308", "equiv_brand": "SKF", "level": "full", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6308", "6308-NTN" ], "locale_variants": {} }, { "sku": "6308-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6308LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45, "static_load_kN": 24, "fatigue_load_limit_kN": 1.83, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6308LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308-2RS-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "Heat is the enemy of the sealed 6308-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6308-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the contact-sealed version as 6308LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 40 mm bore puts 6308 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5300 r/min the grease limiting speed for 6308 covers medium-duty industrial drives; the contact seal (LLU) is the main speed limiter here — for continuous operation above 80% of this figure use the open variant with an external labyrinth seal and oil bath.", "NTN rates 6308 at 45 kN dynamic (C) and 24 kN static (C0), 1.83 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 630 g, 6308 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 40×90×23 mm envelope of 6308 gives a D/d ratio of 2.25 and 25.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 45/24 kN load ratings, 1.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 5300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 630 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6308LLU on the 40×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6308 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6308 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6308-2RS-NTN bearing?", "a": "A 6308-2RS-NTN deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 40 mm bore?", "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6308 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6308 uses the same ISO 15 envelope (40×90×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6308?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6308LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 40×90×23 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6308LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6308-llu", "6308llu", "6308-2RS", "6308-2rs", "6308LLU", "6308-2RS-NTN" ], "locale_variants": {} }, { "sku": "6308-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6308LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45, "static_load_kN": 24, "fatigue_load_limit_kN": 1.83, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6308LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "A 40 mm shaft for 6308 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "RSR low-friction seals on 6308-RSR-NTN run faster than contact-seal 6308-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6308-2RS instead.", "The non-contact lip of 6308-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6308-RSR-NTN and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6308-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues this low-friction non-contact seal as 6308LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 40 mm bore puts 6308 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6400 r/min the grease limiting speed for 6308 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6308 at 45 kN dynamic (C) and 24 kN static (C0), 1.83 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 630 g, 6308 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 40×90×23 mm envelope of 6308 gives a D/d ratio of 2.25 and 25.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 45/24 kN load ratings, 1.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 630 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6308LLB on the 40×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6308 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6308-RSR-NTN bearing?", "a": "A 6308-RSR-NTN deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6308 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6308 uses the same ISO 15 envelope (40×90×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6308-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6308-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6308 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6308?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6308LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 40×90×23 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6308LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6308-llb", "6308llb", "6308-RSR", "6308-rsr", "6308LLB", "6308-RSR-NTN" ], "locale_variants": {} }, { "sku": "6308-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6308ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45, "static_load_kN": 24, "fatigue_load_limit_kN": 1.83, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6308ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 40 mm shaft for 6308 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium section at 40 mm bore gains dynamic rating through larger rolling elements on a 90 mm OD; the penalty is mass and a lower limiting speed than the 6208 — do not specify it for speed-critical shafts.", "Do not wash 6308-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6308-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6308-ZZ-NTN drags the lip and overheats it.", "NTN catalogues the shielded version as 6308ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 40 mm bore puts 6308 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6400 r/min the grease limiting speed for 6308 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6308 at 45 kN dynamic (C) and 24 kN static (C0), 1.83 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 630 g, 6308 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 40×90×23 mm envelope of 6308 gives a D/d ratio of 2.25 and 25.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 45/24 kN load ratings, 1.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 630 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6308ZZ on the 40×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6308 in a rated drive.", "Standard catalogue stock of 6308 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6308 is listed." ], "faq": [ { "q": "What are the dimensions of a 6308-ZZ-NTN bearing?", "a": "A 6308-ZZ-NTN deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6308 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6308 uses the same ISO 15 envelope (40×90×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6308-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6308-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6308 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6308?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6308ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 40×90×23 mm ISO 15 envelope." }, { "q": "Does NTN offer 6308 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6308ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6308-zz", "6308zz", "6308-ZZ", "6308ZZ", "6308-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6408-NTN", "brand": "NTN", "manufacturer_designation": "6408", "series": "6400-series", "type": "deep_groove", "d_mm": 40, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 70.5, "static_load_kN": 36.5, "fatigue_load_limit_kN": 2.85, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 1230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6408 carries bore code 08 = 40 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6408-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 40 mm bore exists for high radial load at moderate rpm; its 110 mm OD and 27 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Storage matters for open bearings: 6408-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6408 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 27 mm-wide ring of 6408-NTN drags the lip and overheats it.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6408 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 40 mm bore puts 6408 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 7000 r/min the grease limiting speed for 6408 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 70.5 kN dynamic load rating (C) and 36.5 kN static (C0), 2.85 kN fatigue load limit Cu, 6408 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1230 g (1.2 kg), 6408 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 40×110×27 mm envelope of 6408 gives a D/d ratio of 2.75 and 35.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 70.5/36.5 kN load ratings, 2.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 7000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6408 on the 40×110×27 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6408 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6408 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6408-NTN bearing?", "a": "A 6408-NTN deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6408-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6408-NTN need?", "a": "The open 6408-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6408?", "a": "NTN lists the open 6408 under the bare designation 6408; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 40 mm bore envelope." }, { "q": "Is 6408 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6408-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6408-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6408", "equiv_brand": "SKF", "level": "full", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6408", "6408-NTN" ], "locale_variants": {} }, { "sku": "6408-ZZ", "brand": "NTN", "manufacturer_designation": "6408ZZ", "series": "6400-series", "type": "deep_groove", "d_mm": 40, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 70.5, "static_load_kN": 36.5, "fatigue_load_limit_kN": 2.85, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 1230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6408-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 110 mm outside diameter and 27 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6408ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6408-ZZ.", "The 64xx heavy section at 40 mm bore exists for high radial load at moderate rpm; its 110 mm OD and 27 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Do not wash 6408-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6408-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6408-ZZ.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6408ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 40 mm bore puts 6408 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 7000 r/min the grease limiting speed for 6408 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 70.5 kN dynamic load rating (C) and 36.5 kN static (C0), 2.85 kN fatigue load limit Cu, 6408 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1230 g (1.2 kg), 6408 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 40×110×27 mm envelope of 6408 gives a D/d ratio of 2.75 and 35.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 70.5/36.5 kN load ratings, 2.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 7000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6408ZZ on the 40×110×27 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6408 in a rated drive.", "Standard catalogue stock of 6408 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6408 is listed." ], "faq": [ { "q": "What are the dimensions of a 6408-ZZ bearing?", "a": "A 6408-ZZ deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6408 bore code work?", "a": "The last two digits of 6408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6408-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 6408?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6408ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 40×110×27 mm ISO 15 envelope." }, { "q": "Does NTN offer 6408 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6408ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6408-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6408-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6408", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6408-zz", "6408zz", "6408-ZZ", "6408ZZ" ], "locale_variants": {} }, { "sku": "61809-NTN", "brand": "NTN", "manufacturer_designation": "6809JR", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.95, "static_load_kN": 4.95, "fatigue_load_limit_kN": 0.33, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 40, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61809 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 58 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Only 6.5 mm of radial section separates bore and OD on the 618xx series at 45 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6209.", "The open 61809-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 45×58×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61809 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61809 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 45 mm bore puts 61809 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 11000 r/min the grease limiting speed for 61809 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61809 at 5.95 kN dynamic (C) and 4.95 kN static (C0), 0.33 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At only 40 g, 61809 is a lightweight bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 45×58×7 mm envelope of 61809 gives a D/d ratio of 1.29 and only 6.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 5.95/4.95 kN load ratings, 0.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 11000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 40 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6809JR on the 45×58×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61809 in a rated drive.", "Standard catalogue stock of 61809 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61809 is listed." ], "faq": [ { "q": "What are the dimensions of a 61809-NTN bearing?", "a": "A 61809-NTN deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61809-NTN have?", "a": "Unless a clearance suffix says otherwise, 61809-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61809 and verify the residual clearance after mounting." }, { "q": "How should 61809-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61809?", "a": "NTN lists the open 61809 under the bare designation 6809JR; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 45 mm bore envelope." }, { "q": "What cage does NTN fit in 6809JR?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61809-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6809jr", "61809", "6809JR", "61809-NTN" ], "locale_variants": {} }, { "sku": "61809-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6809JRLLU", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.95, "static_load_kN": 4.95, "fatigue_load_limit_kN": 0.33, "limiting_speed_rpm": 5900, "max_rpm": 5900, "weight_g": 40, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61809-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 58 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6809JRLLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "A 45 mm shaft for 61809 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "Contact seals add drag and heat: 61809-2RS-NTN runs slower and cooler-limited than the open 61809; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61809-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 58 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61809-2RS-NTN.", "NTN catalogues the contact-sealed version as 6809JRLLU (suffix RLLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 45 mm bore puts 61809 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5900 r/min the grease limiting speed for 61809 covers medium-duty industrial drives; the contact seal (LLU) is the main speed limiter here — for continuous operation above 80% of this figure use the open variant with an external labyrinth seal and oil bath.", "NTN rates 61809 at 5.95 kN dynamic (C) and 4.95 kN static (C0), 0.33 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At only 40 g, 61809 is a lightweight bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 45×58×7 mm envelope of 61809 gives a D/d ratio of 1.29 and only 6.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 5.95/4.95 kN load ratings, 0.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 5900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 40 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6809JRLLU on the 45×58×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61809 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61809 is listed.", "Standard catalogue stock of 61809 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61809-2RS-NTN bearing?", "a": "A 61809-2RS-NTN deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61809-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61809-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61809 and verify the residual clearance after mounting." }, { "q": "How should 61809-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61809?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6809JRLLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×58×7 mm ISO 15 envelope." }, { "q": "Does NTN offer 61809 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6809JRLLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61809-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61809-llu", "6809jrllu", "6809llu", "61809-2RS", "61809-2rs", "6809JRLLU", "61809-2RS-NTN" ], "locale_variants": {} }, { "sku": "61809-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6809JRLLB", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.95, "static_load_kN": 4.95, "fatigue_load_limit_kN": 0.33, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 40, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61809-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 58 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6809JRLLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-RSR-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "RSR low-friction seals on 61809-RSR-NTN run faster than contact-seal 61809-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61809-2RS instead.", "The non-contact lip of 61809-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues this low-friction non-contact seal as 6809JRLLB (suffix RLLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 45 mm bore puts 61809 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 11000 r/min the grease limiting speed for 61809 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61809 at 5.95 kN dynamic (C) and 4.95 kN static (C0), 0.33 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At only 40 g, 61809 is a lightweight bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 45×58×7 mm envelope of 61809 gives a D/d ratio of 1.29 and only 6.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 5.95/4.95 kN load ratings, 0.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 11000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 40 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6809JRLLB on the 45×58×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61809 in a rated drive.", "Order the C3 internal-clearance version (61809 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61809 is listed." ], "faq": [ { "q": "What are the dimensions of a 61809-RSR-NTN bearing?", "a": "A 61809-RSR-NTN deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61809-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61809?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6809JRLLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×58×7 mm ISO 15 envelope." }, { "q": "Is 6809JRLLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61809-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61809-llb", "6809jrllb", "6809llb", "61809-RSR", "61809-rsr", "6809JRLLB", "61809-RSR-NTN" ], "locale_variants": {} }, { "sku": "61809-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6809JRZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.95, "static_load_kN": 4.95, "fatigue_load_limit_kN": 0.33, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 40, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6809JRZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61809-ZZ-NTN.", "Only 6.5 mm of radial section separates bore and OD on the 618xx series at 45 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6209.", "ZZ shields are non-contact: 61809-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61809-2RS for that.", "Do not wash 61809-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61809-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6809JRZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 45 mm bore puts 61809 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 11000 r/min the grease limiting speed for 61809 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61809 at 5.95 kN dynamic (C) and 4.95 kN static (C0), 0.33 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At only 40 g, 61809 is a lightweight bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 45×58×7 mm envelope of 61809 gives a D/d ratio of 1.29 and only 6.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 5.95/4.95 kN load ratings, 0.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 11000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 40 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6809JRZZ on the 45×58×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61809 in a rated drive.", "Standard catalogue stock of 61809 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61809 is listed." ], "faq": [ { "q": "What are the dimensions of a 61809-ZZ-NTN bearing?", "a": "A 61809-ZZ-NTN deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61809-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61809?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6809JRZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×58×7 mm ISO 15 envelope." }, { "q": "Does NTN offer 61809 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6809JRZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61809-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61809-zz", "6809jrzz", "6809zz", "61809-ZZ", "6809JRZZ", "61809-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61909-NTN", "brand": "NTN", "manufacturer_designation": "6909", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.5, "static_load_kN": 10.4, "fatigue_load_limit_kN": 0.73, "limiting_speed_rpm": 9800, "max_rpm": 9800, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61909 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 68 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61909-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 45×68×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61909-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 61909-NTN drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61909 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 45 mm bore puts 61909 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 9800 r/min the grease limiting speed for 61909 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61909 at 14.5 kN dynamic (C) and 10.4 kN static (C0), 0.73 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 128 g, 61909 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 45×68×12 mm envelope of 61909 gives a D/d ratio of 1.51 and 11.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 14.5/10.4 kN load ratings, 0.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 9800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 128 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6909 on the 45×68×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61909 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61909 is listed." ], "faq": [ { "q": "What are the dimensions of a 61909-NTN bearing?", "a": "A 61909-NTN deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 45 mm bore?", "a": "619 is a thin section one step above 618: 68×12 mm with an 11.5 mm radial section at 45 mm bore; a 6209 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61909 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61909 uses the same ISO 15 envelope (45×68×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61909?", "a": "NTN lists the open 61909 under the bare designation 6909; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 45 mm bore envelope." }, { "q": "Is 6909 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61909-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909", "equiv_brand": "SKF", "level": "full", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6909", "61909", "61909-NTN" ], "locale_variants": {} }, { "sku": "61909-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6909LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.5, "static_load_kN": 10.4, "fatigue_load_limit_kN": 0.73, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6909LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 45 mm shaft for 61909 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section at 45 mm bore (11.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61909-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61909-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 61909-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6909LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 45 mm bore puts 61909 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5600 r/min the grease limiting speed for 61909 covers medium-duty industrial drives; the contact seal (LLU) is the main speed limiter here — for continuous operation above 80% of this figure use the open variant with an external labyrinth seal and oil bath.", "NTN rates 61909 at 14.5 kN dynamic (C) and 10.4 kN static (C0), 0.73 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 128 g, 61909 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 45×68×12 mm envelope of 61909 gives a D/d ratio of 1.51 and 11.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 14.5/10.4 kN load ratings, 0.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 5600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 128 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6909LLU on the 45×68×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61909 in a rated drive.", "Standard catalogue stock of 61909 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61909 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61909-2RS-NTN bearing?", "a": "A 61909-2RS-NTN deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61909 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61909 uses the same ISO 15 envelope (45×68×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61909-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61909-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61909 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61909?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6909LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×68×12 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6909LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61909-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61909-llu", "6909llu", "61909-2RS", "61909-2rs", "6909LLU", "61909-2RS-NTN" ], "locale_variants": {} }, { "sku": "61909-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6909LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.5, "static_load_kN": 10.4, "fatigue_load_limit_kN": 0.73, "limiting_speed_rpm": 9800, "max_rpm": 9800, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61909-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 68 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6909LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61909-RSR-NTN.", "The 619xx thin section at 45 mm bore (11.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The low-drag lip of 61909-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61909-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues this low-friction non-contact seal as 6909LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 45 mm bore puts 61909 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 9800 r/min the grease limiting speed for 61909 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61909 at 14.5 kN dynamic (C) and 10.4 kN static (C0), 0.73 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 128 g, 61909 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 45×68×12 mm envelope of 61909 gives a D/d ratio of 1.51 and 11.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 14.5/10.4 kN load ratings, 0.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 9800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 128 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6909LLB on the 45×68×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61909 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61909 is listed." ], "faq": [ { "q": "What are the dimensions of a 61909-RSR-NTN bearing?", "a": "A 61909-RSR-NTN deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 45 mm bore?", "a": "619 is a thin section one step above 618: 68×12 mm with an 11.5 mm radial section at 45 mm bore; a 6209 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61909 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61909 uses the same ISO 15 envelope (45×68×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61909?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6909LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×68×12 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6909LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61909-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61909-llb", "6909llb", "61909-RSR", "61909-rsr", "6909LLB", "61909-RSR-NTN" ], "locale_variants": {} }, { "sku": "61909-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6909ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.5, "static_load_kN": 10.4, "fatigue_load_limit_kN": 0.73, "limiting_speed_rpm": 9800, "max_rpm": 9800, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6909ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "A 45 mm shaft for 61909 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61909-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61909-2RS for that.", "Shielded 61909-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 61909-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 45 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6909ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 45 mm bore puts 61909 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 9800 r/min the grease limiting speed for 61909 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61909 at 14.5 kN dynamic (C) and 10.4 kN static (C0), 0.73 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 128 g, 61909 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 45×68×12 mm envelope of 61909 gives a D/d ratio of 1.51 and 11.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 14.5/10.4 kN load ratings, 0.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 9800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 128 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6909ZZ on the 45×68×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61909 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61909 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61909-ZZ-NTN bearing?", "a": "A 61909-ZZ-NTN deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61909-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 61909?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6909ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×68×12 mm ISO 15 envelope." }, { "q": "Is 6909ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61909-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61909-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61909-zz", "6909zz", "61909-ZZ", "6909ZZ", "61909-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16009", "brand": "NTN", "manufacturer_designation": "16009", "series": "16000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.3, "static_load_kN": 10.5, "fatigue_load_limit_kN": 0.72, "limiting_speed_rpm": 9200, "max_rpm": 9200, "weight_g": 171, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16009; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 45 mm bore shares the 75 mm outside diameter of the 6009 but is only 10 mm wide; a 6009 in a 10 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16009 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×75×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16009 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 75 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16009.", "Vibration during standstill brinells the raceways of a 45 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 16009 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 45 mm bore puts 16009 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 9200 r/min the grease limiting speed for 16009 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 16009 at 14.3 kN dynamic (C) and 10.5 kN static (C0), 0.72 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 171 g, 16009 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 45×75×10 mm envelope of 16009 gives a D/d ratio of 1.67 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 14.3/10.5 kN load ratings, 0.72 kN fatigue load limit Cu NTN lists the grease limiting speed at 9200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 171 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16009 on the 45×75×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16009 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 16009 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16009 bearing?", "a": "A 16009 deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 10 mm width (1.772 × 2.953 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 16009 mean?", "a": "A bare 16009 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 45 mm bore?", "a": "160 is the narrow extra-light section: 75×10 mm with a 15.0 mm radial section at 45 mm bore. It has the same bore and outside diameter as the 6009 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN order number for an open 16009?", "a": "NTN lists the open 16009 under the bare designation 16009; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 45 mm bore envelope." }, { "q": "Is 16009 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16009" ], "locale_variants": {} }, { "sku": "6009-NTN", "brand": "NTN", "manufacturer_designation": "6009", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.2, "static_load_kN": 15.1, "fatigue_load_limit_kN": 1.16, "limiting_speed_rpm": 9200, "max_rpm": 9200, "weight_g": 237, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6009 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6009-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 45×75×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6009 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 75 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6009-NTN.", "Vibration during standstill brinells the raceways of a 45 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6009 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 45 mm bore puts 6009 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 9200 r/min the grease limiting speed for 6009 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 23.2 kN dynamic load rating (C) and 15.1 kN static (C0), 1.16 kN fatigue load limit Cu, 6009 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 237 g, 6009 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×75×16 mm envelope of 6009 gives a D/d ratio of 1.67 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 23.2/15.1 kN load ratings, 1.16 kN fatigue load limit Cu NTN lists the grease limiting speed at 9200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 237 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6009 on the 45×75×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6009 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6009 is listed." ], "faq": [ { "q": "What are the dimensions of a 6009-NTN bearing?", "a": "A 6009-NTN deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6009 mean?", "a": "A bare 6009 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6009?", "a": "NTN lists the open 6009 under the bare designation 6009; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 45 mm bore envelope." }, { "q": "What cage does NTN fit in 6009?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009", "equiv_brand": "SKF", "level": "full", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6009", "6009-NTN" ], "locale_variants": {} }, { "sku": "6009-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6009LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.2, "static_load_kN": 15.1, "fatigue_load_limit_kN": 1.16, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 237, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6009LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "A 45 mm shaft for 6009 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 45 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6209 before committing to the smaller envelope.", "Contact seals add drag and heat: 6009-2RS-NTN runs slower and cooler-limited than the open 6009; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6009-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "The housing bore for the 75 mm OD should be round within IT7; an oval bore pinches the outer ring of 6009-2RS-NTN and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6009LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 45 mm bore puts 6009 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5400 r/min the grease limiting speed for 6009 covers medium-duty industrial drives; the contact seal (LLU) is the main speed limiter here — for continuous operation above 80% of this figure use the open variant with an external labyrinth seal and oil bath.", "At 23.2 kN dynamic load rating (C) and 15.1 kN static (C0), 1.16 kN fatigue load limit Cu, 6009 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 237 g, 6009 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×75×16 mm envelope of 6009 gives a D/d ratio of 1.67 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 23.2/15.1 kN load ratings, 1.16 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 237 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6009LLU on the 45×75×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6009 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6009 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6009-2RS-NTN bearing?", "a": "A 6009-2RS-NTN deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6009-2RS-NTN need?", "a": "6009-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6009 with a housing grease fitting instead." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6009?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6009LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×75×16 mm ISO 15 envelope." }, { "q": "Does NTN offer 6009 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6009LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6009-llu", "6009llu", "6009-2RS", "6009-2rs", "6009LLU", "6009-2RS-NTN" ], "locale_variants": {} }, { "sku": "6009-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6009LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.2, "static_load_kN": 15.1, "fatigue_load_limit_kN": 1.16, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 237, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6009-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6009LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009-RSR-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6009-RSR-NTN run faster than contact-seal 6009-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6009-2RS instead.", "The low-drag lip of 6009-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The housing bore for the 75 mm OD should be round within IT7; an oval bore pinches the outer ring of 6009-RSR-NTN and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 75 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6009-RSR-NTN.", "NTN catalogues this low-friction non-contact seal as 6009LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 45 mm bore puts 6009 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6500 r/min the grease limiting speed for 6009 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 23.2 kN dynamic load rating (C) and 15.1 kN static (C0), 1.16 kN fatigue load limit Cu, 6009 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 237 g, 6009 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×75×16 mm envelope of 6009 gives a D/d ratio of 1.67 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 23.2/15.1 kN load ratings, 1.16 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 237 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6009LLB on the 45×75×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6009 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6009 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6009-RSR-NTN bearing?", "a": "A 6009-RSR-NTN deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6009-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6009-RSR-NTN need?", "a": "6009-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6009 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6009?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6009LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×75×16 mm ISO 15 envelope." }, { "q": "Does NTN offer 6009 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6009LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6009-llb", "6009llb", "6009-RSR", "6009-rsr", "6009LLB", "6009-RSR-NTN" ], "locale_variants": {} }, { "sku": "6009-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6009ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.2, "static_load_kN": 15.1, "fatigue_load_limit_kN": 1.16, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 237, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6009-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6009ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 45 mm shaft for 6009 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6009-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6009-2RS for that.", "Do not wash 6009-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6009ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 45 mm bore puts 6009 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6500 r/min the grease limiting speed for 6009 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 23.2 kN dynamic load rating (C) and 15.1 kN static (C0), 1.16 kN fatigue load limit Cu, 6009 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 237 g, 6009 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×75×16 mm envelope of 6009 gives a D/d ratio of 1.67 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 23.2/15.1 kN load ratings, 1.16 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 237 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6009ZZ on the 45×75×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6009 in a rated drive.", "Standard catalogue stock of 6009 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6009 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6009-ZZ-NTN bearing?", "a": "A 6009-ZZ-NTN deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6009-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 45 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN suffix for a sealed 6009?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6009ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×75×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6009ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6009-zz", "6009zz", "6009-ZZ", "6009ZZ", "6009-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6209-NTN", "brand": "NTN", "manufacturer_designation": "6209", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 7800, "max_rpm": 7800, "weight_g": 398, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6209-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6209 units.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6209 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 45 mm bore puts 6209 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 7800 r/min the grease limiting speed for 6209 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6209 at 36 kN dynamic (C) and 20.4 kN static (C0), 1.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 398 g, 6209 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×85×19 mm envelope of 6209 gives a D/d ratio of 1.89 and 20.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 36/20.4 kN load ratings, 1.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 7800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 398 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6209 on the 45×85×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6209 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (6209 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6209-NTN bearing?", "a": "A 6209-NTN deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6209 mean?", "a": "A bare 6209 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "What is the NTN order number for an open 6209?", "a": "NTN lists the open 6209 under the bare designation 6209; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 45 mm bore envelope." }, { "q": "Is 6209 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "full", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6209", "6209-NTN" ], "locale_variants": {} }, { "sku": "6209-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6209LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 5200, "max_rpm": 5200, "weight_g": 398, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6209-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 85 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6209LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209-2RS-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 45 mm bore the 62xx light series is the workhorse section; its 85×19 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6209-2RS-NTN runs slower and cooler-limited than the open 6209; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6209-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6209-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Never mix components between two 6209-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the contact-sealed version as 6209LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 45 mm bore puts 6209 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5200 r/min the grease limiting speed for 6209 covers medium-duty industrial drives; the contact seal (LLU) is the main speed limiter here — for continuous operation above 80% of this figure use the open variant with an external labyrinth seal and oil bath.", "NTN rates 6209 at 36 kN dynamic (C) and 20.4 kN static (C0), 1.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 398 g, 6209 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×85×19 mm envelope of 6209 gives a D/d ratio of 1.89 and 20.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 36/20.4 kN load ratings, 1.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 5200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 398 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6209LLU on the 45×85×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6209 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6209 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6209-2RS-NTN bearing?", "a": "A 6209-2RS-NTN deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6209-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6209-2RS-NTN need?", "a": "6209-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6209 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6209?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6209LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×85×19 mm ISO 15 envelope." }, { "q": "Does NTN offer 6209 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6209LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6209-llu", "6209llu", "6209-2RS", "6209-2rs", "6209LLU", "6209-2RS-NTN" ], "locale_variants": {} }, { "sku": "6209-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6209LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 6200, "max_rpm": 6200, "weight_g": 398, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6209-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 85 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6209LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209-RSR-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6209-RSR-NTN run faster than contact-seal 6209-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6209-2RS instead.", "The low-drag lip of 6209-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Measure the shaft, do not trust the drawing: a 45 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6209-RSR-NTN.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues this low-friction non-contact seal as 6209LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 45 mm bore puts 6209 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6200 r/min the grease limiting speed for 6209 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6209 at 36 kN dynamic (C) and 20.4 kN static (C0), 1.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 398 g, 6209 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×85×19 mm envelope of 6209 gives a D/d ratio of 1.89 and 20.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 36/20.4 kN load ratings, 1.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 6200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 398 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6209LLB on the 45×85×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6209 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6209 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6209-RSR-NTN bearing?", "a": "A 6209-RSR-NTN deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "Are 6209 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6209 uses the same ISO 15 envelope (45×85×19 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6209?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6209LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×85×19 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6209LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6209-llb", "6209llb", "6209-RSR", "6209-rsr", "6209LLB", "6209-RSR-NTN" ], "locale_variants": {} }, { "sku": "6209-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6209ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 6200, "max_rpm": 6200, "weight_g": 398, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6209ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209-ZZ-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 45 mm bore the 62xx light series is the workhorse section; its 85×19 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6209-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6209-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 45 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6209ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 45 mm bore puts 6209 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6200 r/min the grease limiting speed for 6209 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6209 at 36 kN dynamic (C) and 20.4 kN static (C0), 1.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 398 g, 6209 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×85×19 mm envelope of 6209 gives a D/d ratio of 1.89 and 20.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 36/20.4 kN load ratings, 1.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 6200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 398 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6209ZZ on the 45×85×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6209 in a rated drive.", "Standard catalogue stock of 6209 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6209-ZZ-NTN bearing?", "a": "A 6209-ZZ-NTN deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "Are 6209 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6209 uses the same ISO 15 envelope (45×85×19 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6209?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6209ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×85×19 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6209ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6209-zz", "6209zz", "6209-ZZ", "6209ZZ", "6209-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6309-NTN", "brand": "NTN", "manufacturer_designation": "6309", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58.5, "static_load_kN": 32, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 814, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6309 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 100 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6309-NTN.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "The open 6309-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 45×100×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6309-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 25 mm-wide ring of 6309-NTN drags the lip and overheats it.", "The open 6309 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 45 mm bore puts 6309 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 7000 r/min the grease limiting speed for 6309 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6309 at 58.5 kN dynamic (C) and 32 kN static (C0), 2.5 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 814 g, 6309 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×100×25 mm envelope of 6309 gives a D/d ratio of 2.22 and 27.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 58.5/32 kN load ratings, 2.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 7000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 814 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6309 on the 45×100×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6309 in a rated drive.", "Standard catalogue stock of 6309 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6309 is listed." ], "faq": [ { "q": "What are the dimensions of a 6309-NTN bearing?", "a": "A 6309-NTN deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6309 mean?", "a": "A bare 6309 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6309?", "a": "NTN lists the open 6309 under the bare designation 6309; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 45 mm bore envelope." }, { "q": "What cage does NTN fit in 6309?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "full", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "full", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "309", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6309", "6309-NTN" ], "locale_variants": {} }, { "sku": "6309-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6309LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58.5, "static_load_kN": 32, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 4700, "max_rpm": 4700, "weight_g": 814, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6309LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "A 45 mm shaft for 6309 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium section at 45 mm bore gains dynamic rating through larger rolling elements on a 100 mm OD; the penalty is mass and a lower limiting speed than the 6209 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6309-2RS-NTN runs slower and cooler-limited than the open 6309; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6309-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 100 mm OD should be round within IT7; an oval bore pinches the outer ring of 6309-2RS-NTN and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 45 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6309-2RS-NTN.", "NTN catalogues the contact-sealed version as 6309LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 45 mm bore puts 6309 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "NTN lists the grease limiting speed at 4700 r/min for 6309; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6309 at 58.5 kN dynamic (C) and 32 kN static (C0), 2.5 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 814 g, 6309 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×100×25 mm envelope of 6309 gives a D/d ratio of 2.22 and 27.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 58.5/32 kN load ratings, 2.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 4700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 814 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6309LLU on the 45×100×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6309 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6309-2RS-NTN bearing?", "a": "A 6309-2RS-NTN deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6309-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6309-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6309 and verify the residual clearance after mounting." }, { "q": "How should 6309-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6309?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6309LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×100×25 mm ISO 15 envelope." }, { "q": "Does NTN offer 6309 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6309LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "full", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "309", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6309-llu", "6309llu", "6309-2RS", "6309-2rs", "6309LLU", "6309-2RS-NTN" ], "locale_variants": {} }, { "sku": "6309-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6309LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58.5, "static_load_kN": 32, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 814, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6309LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6309-RSR-NTN; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "RSR low-friction seals on 6309-RSR-NTN run faster than contact-seal 6309-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6309-2RS instead.", "The low-drag lip of 6309-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6309-RSR-NTN.", "Measure the shaft, do not trust the drawing: a 45 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6309-RSR-NTN.", "NTN catalogues this low-friction non-contact seal as 6309LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 45 mm bore puts 6309 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5600 r/min the grease limiting speed for 6309 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6309 at 58.5 kN dynamic (C) and 32 kN static (C0), 2.5 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 814 g, 6309 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×100×25 mm envelope of 6309 gives a D/d ratio of 2.22 and 27.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 58.5/32 kN load ratings, 2.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 5600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 814 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6309LLB on the 45×100×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6309 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6309 is listed.", "Order the C3 internal-clearance version (6309 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6309-RSR-NTN bearing?", "a": "A 6309-RSR-NTN deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6309-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 6309?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6309LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×100×25 mm ISO 15 envelope." }, { "q": "Is 6309LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "full", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "309", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6309-llb", "6309llb", "6309-RSR", "6309-rsr", "6309LLB", "6309-RSR-NTN" ], "locale_variants": {} }, { "sku": "6309-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6309ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58.5, "static_load_kN": 32, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 814, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6309-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 100 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6309ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 45 mm shaft for 6309 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "Do not wash 6309-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6309-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6309-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "Vibration during standstill brinells the raceways of a 45 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6309ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 45 mm bore puts 6309 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5600 r/min the grease limiting speed for 6309 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6309 at 58.5 kN dynamic (C) and 32 kN static (C0), 2.5 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 814 g, 6309 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 45×100×25 mm envelope of 6309 gives a D/d ratio of 2.22 and 27.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 58.5/32 kN load ratings, 2.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 5600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 814 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6309ZZ on the 45×100×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6309 in a rated drive.", "Order the C3 internal-clearance version (6309 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6309-ZZ-NTN bearing?", "a": "A 6309-ZZ-NTN deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6309-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 6309?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6309ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×100×25 mm ISO 15 envelope." }, { "q": "Does NTN offer 6309 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6309ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "full", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "309", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6309-zz", "6309zz", "6309-ZZ", "6309ZZ", "6309-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6409-NTN", "brand": "NTN", "manufacturer_designation": "6409", "series": "6400-series", "type": "deep_groove", "d_mm": 45, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.5, "static_load_kN": 45, "fatigue_load_limit_kN": 3.5, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 1530, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6409-NTN.", "The 64xx heavy section at 45 mm bore exists for high radial load at moderate rpm; its 120 mm OD and 29 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Storage matters for open bearings: 6409-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6409 units.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 120 mm OD should be round within IT7; an oval bore pinches the outer ring of 6409-NTN and shows up later as two-point loaded raceway wear.", "The open 6409 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 45 mm bore puts 6409 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6300 r/min the grease limiting speed for 6409 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 85.5 kN dynamic load rating (C) and 45 kN static (C0), 3.5 kN fatigue load limit Cu, 6409 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1530 g (1.5 kg), 6409 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 45×120×29 mm envelope of 6409 gives a D/d ratio of 2.67 and 37.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 85.5/45 kN load ratings, 3.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 6300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1530 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6409 on the 45×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6409 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6409-NTN bearing?", "a": "A 6409-NTN deep-groove ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6409-NTN need?", "a": "The open 6409-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6409 bore code work?", "a": "The last two digits of 6409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6409?", "a": "NTN lists the open 6409 under the bare designation 6409; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 45 mm bore envelope." }, { "q": "Is 6409 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6409-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6409", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6409", "6409-NTN" ], "locale_variants": {} }, { "sku": "6409-ZZ", "brand": "NTN", "manufacturer_designation": "6409ZZ", "series": "6400-series", "type": "deep_groove", "d_mm": 45, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.5, "static_load_kN": 45, "fatigue_load_limit_kN": 3.5, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 1530, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6409-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 120 mm outside diameter and 29 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6409ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 45 mm shaft for 6409 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 64xx heavy section at 45 mm bore exists for high radial load at moderate rpm; its 120 mm OD and 29 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Do not wash 6409-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6409-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6409ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 45 mm bore puts 6409 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6300 r/min the grease limiting speed for 6409 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 85.5 kN dynamic load rating (C) and 45 kN static (C0), 3.5 kN fatigue load limit Cu, 6409 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1530 g (1.5 kg), 6409 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 45×120×29 mm envelope of 6409 gives a D/d ratio of 2.67 and 37.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 85.5/45 kN load ratings, 3.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 6300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1530 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6409ZZ on the 45×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6409 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6409 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6409-ZZ bearing?", "a": "A 6409-ZZ deep-groove ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6409 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6409 uses the same ISO 15 envelope (45×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6409-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6409-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6409 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6409?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6409ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 45×120×29 mm ISO 15 envelope." }, { "q": "Is 6409ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6409-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6409", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6409-zz", "6409zz", "6409-ZZ", "6409ZZ" ], "locale_variants": {} }, { "sku": "61810-NTN", "brand": "NTN", "manufacturer_designation": "6810JR", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.3, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.41, "limiting_speed_rpm": 9600, "max_rpm": 9600, "weight_g": 52, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61810 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 65 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61810 against the shaft shoulder while it cools so the ring cannot creep back.", "Only 7.5 mm of radial section separates bore and OD on the 618xx series at 50 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6210.", "Storage matters for open bearings: 61810-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61810 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61810 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 50 mm bore puts 61810 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 9600 r/min the grease limiting speed for 61810 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61810 at 7.3 kN dynamic (C) and 6.1 kN static (C0), 0.41 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 52 g, 61810 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 50×65×7 mm envelope of 61810 gives a D/d ratio of 1.30 and only 7.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 7.3/6.1 kN load ratings, 0.41 kN fatigue load limit Cu NTN lists the grease limiting speed at 9600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 52 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6810JR on the 50×65×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61810 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61810-NTN bearing?", "a": "A 61810-NTN deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61810-NTN need?", "a": "The open 61810-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61810 bore code work?", "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61810?", "a": "NTN lists the open 61810 under the bare designation 6810JR; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 50 mm bore envelope." }, { "q": "Is 6810JR a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61810-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6810jr", "61810", "6810JR", "61810-NTN" ], "locale_variants": {} }, { "sku": "61810-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6810JRLLU", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.3, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.41, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 52, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6810JRLLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61810 with C3 for those conditions.", "Only 7.5 mm of radial section separates bore and OD on the 618xx series at 50 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6210.", "Heat is the enemy of the sealed 61810-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61810-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61810-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6810JRLLU (suffix RLLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 50 mm bore puts 61810 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5300 r/min the grease limiting speed for 61810 covers medium-duty industrial drives; the contact seal (LLU) is the main speed limiter here — for continuous operation above 80% of this figure use the open variant with an external labyrinth seal and oil bath.", "NTN rates 61810 at 7.3 kN dynamic (C) and 6.1 kN static (C0), 0.41 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 52 g, 61810 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 50×65×7 mm envelope of 61810 gives a D/d ratio of 1.30 and only 7.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 7.3/6.1 kN load ratings, 0.41 kN fatigue load limit Cu NTN lists the grease limiting speed at 5300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 52 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6810JRLLU on the 50×65×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61810 in a rated drive.", "Standard catalogue stock of 61810 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61810-2RS-NTN bearing?", "a": "A 61810-2RS-NTN deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61810 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61810 uses the same ISO 15 envelope (50×65×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61810-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61810-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61810 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61810?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6810JRLLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×65×7 mm ISO 15 envelope." }, { "q": "Is 6810JRLLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61810-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61810-llu", "6810jrllu", "6810llu", "61810-2RS", "61810-2rs", "6810JRLLU", "61810-2RS-NTN" ], "locale_variants": {} }, { "sku": "61810-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6810JRLLB", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.3, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.41, "limiting_speed_rpm": 9600, "max_rpm": 9600, "weight_g": 52, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61810-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 65 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6810JRLLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61810 with C3 for those conditions.", "Only 7.5 mm of radial section separates bore and OD on the 618xx series at 50 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6210.", "The low-drag lip of 61810-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61810-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6810JRLLB (suffix RLLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 50 mm bore puts 61810 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 9600 r/min the grease limiting speed for 61810 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61810 at 7.3 kN dynamic (C) and 6.1 kN static (C0), 0.41 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 52 g, 61810 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 50×65×7 mm envelope of 61810 gives a D/d ratio of 1.30 and only 7.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 7.3/6.1 kN load ratings, 0.41 kN fatigue load limit Cu NTN lists the grease limiting speed at 9600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 52 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6810JRLLB on the 50×65×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61810 in a rated drive.", "Standard catalogue stock of 61810 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61810-RSR-NTN bearing?", "a": "A 61810-RSR-NTN deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 50 mm bore?", "a": "618 is an extra-thin section: 65×7 mm, only 7.5 mm radial section at 50 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61810 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61810 uses the same ISO 15 envelope (50×65×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61810?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6810JRLLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×65×7 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6810JRLLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61810-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61810-llb", "6810jrllb", "6810llb", "61810-RSR", "61810-rsr", "6810JRLLB", "61810-RSR-NTN" ], "locale_variants": {} }, { "sku": "61810-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6810JRZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.3, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.41, "limiting_speed_rpm": 9600, "max_rpm": 9600, "weight_g": 52, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6810JRZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61810 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "ZZ shields are non-contact: 61810-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61810-2RS for that.", "Do not wash 61810-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The housing bore for the 65 mm OD should be round within IT7; an oval bore pinches the outer ring of 61810-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6810JRZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 50 mm bore puts 61810 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 9600 r/min the grease limiting speed for 61810 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61810 at 7.3 kN dynamic (C) and 6.1 kN static (C0), 0.41 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 52 g, 61810 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 50×65×7 mm envelope of 61810 gives a D/d ratio of 1.30 and only 7.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 7.3/6.1 kN load ratings, 0.41 kN fatigue load limit Cu NTN lists the grease limiting speed at 9600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 52 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6810JRZZ on the 50×65×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61810 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61810-ZZ-NTN bearing?", "a": "A 61810-ZZ-NTN deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61810-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61810-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61810 and verify the residual clearance after mounting." }, { "q": "How should 61810-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61810?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6810JRZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×65×7 mm ISO 15 envelope." }, { "q": "Is 6810JRZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61810-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61810-zz", "6810jrzz", "6810zz", "61810-ZZ", "6810JRZZ", "61810-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61910-NTN", "brand": "NTN", "manufacturer_designation": "6910", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.9, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.77, "limiting_speed_rpm": 8900, "max_rpm": 8900, "weight_g": 132, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61910 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61910-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61910 units.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61910 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 50 mm bore puts 61910 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 8900 r/min the grease limiting speed for 61910 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61910 at 14.9 kN dynamic (C) and 11.2 kN static (C0), 0.77 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 132 g, 61910 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 50×72×12 mm envelope of 61910 gives a D/d ratio of 1.44 and 11.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 14.9/11.2 kN load ratings, 0.77 kN fatigue load limit Cu NTN lists the grease limiting speed at 8900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 132 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6910 on the 50×72×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61910 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61910 is listed.", "Standard catalogue stock of 61910 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61910-NTN bearing?", "a": "A 61910-NTN deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with an 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61910 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61910 uses the same ISO 15 envelope (50×72×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61910?", "a": "NTN lists the open 61910 under the bare designation 6910; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 50 mm bore envelope." }, { "q": "Is 6910 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61910-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910", "equiv_brand": "SKF", "level": "full", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6910", "61910", "61910-NTN" ], "locale_variants": {} }, { "sku": "61910-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6910LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.9, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.77, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 132, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6910LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.", "The 619xx thin section at 50 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61910-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61910-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61910-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the contact-sealed version as 6910LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 50 mm bore puts 61910 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5100 r/min the grease limiting speed for 61910 covers medium-duty industrial drives; the contact seal (LLU) is the main speed limiter here — for continuous operation above 80% of this figure use the open variant with an external labyrinth seal and oil bath.", "NTN rates 61910 at 14.9 kN dynamic (C) and 11.2 kN static (C0), 0.77 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 132 g, 61910 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 50×72×12 mm envelope of 61910 gives a D/d ratio of 1.44 and 11.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 14.9/11.2 kN load ratings, 0.77 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 132 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6910LLU on the 50×72×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61910 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 61910 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61910-2RS-NTN bearing?", "a": "A 61910-2RS-NTN deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61910-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61910-2RS-NTN need?", "a": "61910-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61910 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61910?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6910LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×72×12 mm ISO 15 envelope." }, { "q": "Does NTN offer 61910 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6910LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61910-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61910-llu", "6910llu", "61910-2RS", "61910-2rs", "6910LLU", "61910-2RS-NTN" ], "locale_variants": {} }, { "sku": "61910-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6910LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.9, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.77, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 132, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61910-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 72 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6910LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61910 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 50 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61910-RSR-NTN run faster than contact-seal 61910-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61910-2RS instead.", "The non-contact lip of 61910-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61910-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61910-RSR-NTN.", "NTN catalogues this low-friction non-contact seal as 6910LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 50 mm bore puts 61910 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6100 r/min the grease limiting speed for 61910 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61910 at 14.9 kN dynamic (C) and 11.2 kN static (C0), 0.77 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 132 g, 61910 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 50×72×12 mm envelope of 61910 gives a D/d ratio of 1.44 and 11.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 14.9/11.2 kN load ratings, 0.77 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 132 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6910LLB on the 50×72×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61910 in a rated drive.", "Standard catalogue stock of 61910 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61910 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61910-RSR-NTN bearing?", "a": "A 61910-RSR-NTN deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with an 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61910 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61910 uses the same ISO 15 envelope (50×72×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61910?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6910LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×72×12 mm ISO 15 envelope." }, { "q": "Does NTN offer 61910 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6910LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61910-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61910-llb", "6910llb", "61910-RSR", "61910-rsr", "6910LLB", "61910-RSR-NTN" ], "locale_variants": {} }, { "sku": "61910-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6910ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.9, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.77, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 132, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61910-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 72 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6910ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61910 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61910-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61910-2RS for that.", "Do not wash 61910-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Never mix components between two 61910-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6910ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 50 mm bore puts 61910 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6100 r/min the grease limiting speed for 61910 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61910 at 14.9 kN dynamic (C) and 11.2 kN static (C0), 0.77 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 132 g, 61910 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 50×72×12 mm envelope of 61910 gives a D/d ratio of 1.44 and 11.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 14.9/11.2 kN load ratings, 0.77 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 132 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6910ZZ on the 50×72×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61910 in a rated drive.", "Order the C3 internal-clearance version (61910 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 61910 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61910-ZZ-NTN bearing?", "a": "A 61910-ZZ-NTN deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61910-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61910-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61910 and verify the residual clearance after mounting." }, { "q": "How should 61910-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61910?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6910ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×72×12 mm ISO 15 envelope." }, { "q": "Does NTN offer 61910 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6910ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61910-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61910-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61910-zz", "6910zz", "61910-ZZ", "6910ZZ", "61910-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16010", "brand": "NTN", "manufacturer_designation": "16010", "series": "16000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.7, "static_load_kN": 11.3, "fatigue_load_limit_kN": 0.76, "limiting_speed_rpm": 8400, "max_rpm": 8400, "weight_g": 180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16010 with C3 for those conditions.", "Because the 160xx narrow section shares the 80 mm OD of the 6010 at 50 mm bore but is only 10 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16010 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×80×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16010 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16010.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 16010 and shows up later as two-point loaded raceway wear.", "The open 16010 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 50 mm bore puts 16010 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 8400 r/min the grease limiting speed for 16010 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 16010 at 14.7 kN dynamic (C) and 11.3 kN static (C0), 0.76 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 180 g, 16010 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 50×80×10 mm envelope of 16010 gives a D/d ratio of 1.60 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 14.7/11.3 kN load ratings, 0.76 kN fatigue load limit Cu NTN lists the grease limiting speed at 8400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16010 on the 50×80×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16010 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 16010 bearing?", "a": "A 16010 deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 10 mm width (1.969 × 3.15 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 50 mm bore?", "a": "160 is the narrow extra-light section: 80×10 mm with a 15.0 mm radial section at 50 mm bore. It has the same bore and outside diameter as the 6010 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16010 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16010 uses the same ISO 15 envelope (50×80×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16010?", "a": "NTN lists the open 16010 under the bare designation 16010; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 50 mm bore envelope." }, { "q": "Is 16010 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16010" ], "locale_variants": {} }, { "sku": "6010-NTN", "brand": "NTN", "manufacturer_designation": "6010", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 16.6, "fatigue_load_limit_kN": 1.24, "limiting_speed_rpm": 8400, "max_rpm": 8400, "weight_g": 261, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6010 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "Choosing the 60xx extra-light section saves radial space at 50 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6210 before committing to the smaller envelope.", "Storage matters for open bearings: 6010-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6010 units.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6010 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 50 mm bore puts 6010 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 8400 r/min the grease limiting speed for 6010 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 24.2 kN dynamic load rating (C) and 16.6 kN static (C0), 1.24 kN fatigue load limit Cu, 6010 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 261 g, 6010 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 50×80×16 mm envelope of 6010 gives a D/d ratio of 1.60 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 24.2/16.6 kN load ratings, 1.24 kN fatigue load limit Cu NTN lists the grease limiting speed at 8400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 261 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6010 on the 50×80×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6010 in a rated drive.", "Order the C3 internal-clearance version (6010 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6010-NTN bearing?", "a": "A 6010-NTN deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6010 mean?", "a": "A bare 6010 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN order number for an open 6010?", "a": "NTN lists the open 6010 under the bare designation 6010; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 50 mm bore envelope." }, { "q": "Does NTN offer 6010 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6010 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010", "equiv_brand": "SKF", "level": "full", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6010", "6010-NTN" ], "locale_variants": {} }, { "sku": "6010-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6010LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 16.6, "fatigue_load_limit_kN": 1.24, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 261, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6010-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6010LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6010 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6010-2RS-NTN runs slower and cooler-limited than the open 6010; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6010-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6010-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6010LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 50 mm bore puts 6010 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5000 r/min the grease limiting speed for 6010 covers medium-duty industrial drives; the contact seal (LLU) is the main speed limiter here — for continuous operation above 80% of this figure use the open variant with an external labyrinth seal and oil bath.", "At 24.2 kN dynamic load rating (C) and 16.6 kN static (C0), 1.24 kN fatigue load limit Cu, 6010 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 261 g, 6010 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 50×80×16 mm envelope of 6010 gives a D/d ratio of 1.60 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 24.2/16.6 kN load ratings, 1.24 kN fatigue load limit Cu NTN lists the grease limiting speed at 5000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 261 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6010LLU on the 50×80×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6010 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6010 is listed." ], "faq": [ { "q": "What are the dimensions of a 6010-2RS-NTN bearing?", "a": "A 6010-2RS-NTN deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6010 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6010 uses the same ISO 15 envelope (50×80×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6010?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6010LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×80×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6010LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6010-llu", "6010llu", "6010-2RS", "6010-2rs", "6010LLU", "6010-2RS-NTN" ], "locale_variants": {} }, { "sku": "6010-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6010LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 16.6, "fatigue_load_limit_kN": 1.24, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 261, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6010-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6010LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6010 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The low-drag lip of 6010-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6010-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues this low-friction non-contact seal as 6010LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 50 mm bore puts 6010 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6000 r/min the grease limiting speed for 6010 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 24.2 kN dynamic load rating (C) and 16.6 kN static (C0), 1.24 kN fatigue load limit Cu, 6010 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 261 g, 6010 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 50×80×16 mm envelope of 6010 gives a D/d ratio of 1.60 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 24.2/16.6 kN load ratings, 1.24 kN fatigue load limit Cu NTN lists the grease limiting speed at 6000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 261 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6010LLB on the 50×80×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6010 in a rated drive.", "Order the C3 internal-clearance version (6010 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6010-RSR-NTN bearing?", "a": "A 6010-RSR-NTN deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6010-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 6010?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6010LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×80×16 mm ISO 15 envelope." }, { "q": "Does NTN offer 6010 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6010LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6010-llb", "6010llb", "6010-RSR", "6010-rsr", "6010LLB", "6010-RSR-NTN" ], "locale_variants": {} }, { "sku": "6010-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6010ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 16.6, "fatigue_load_limit_kN": 1.24, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 261, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6010ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6010 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Do not wash 6010-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6010-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6010-ZZ-NTN.", "NTN catalogues the shielded version as 6010ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 50 mm bore puts 6010 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6000 r/min the grease limiting speed for 6010 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 24.2 kN dynamic load rating (C) and 16.6 kN static (C0), 1.24 kN fatigue load limit Cu, 6010 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 261 g, 6010 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 50×80×16 mm envelope of 6010 gives a D/d ratio of 1.60 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 24.2/16.6 kN load ratings, 1.24 kN fatigue load limit Cu NTN lists the grease limiting speed at 6000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 261 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6010ZZ on the 50×80×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6010 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6010 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6010-ZZ-NTN bearing?", "a": "A 6010-ZZ-NTN deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6010-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN suffix for a sealed 6010?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6010ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×80×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6010ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6010-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6010-zz", "6010zz", "6010-ZZ", "6010ZZ", "6010-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6210-NTN", "brand": "NTN", "manufacturer_designation": "6210", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.82, "limiting_speed_rpm": 7100, "max_rpm": 7100, "weight_g": 454, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6210 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 90 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6210 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6210-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6210 units.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Never mix components between two 6210-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6210 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 50 mm bore puts 6210 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 7100 r/min the grease limiting speed for 6210 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6210 at 39 kN dynamic (C) and 23.2 kN static (C0), 1.82 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 454 g, 6210 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 50×90×20 mm envelope of 6210 gives a D/d ratio of 1.80 and 20.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 39/23.2 kN load ratings, 1.82 kN fatigue load limit Cu NTN lists the grease limiting speed at 7100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 454 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6210 on the 50×90×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6210 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6210-NTN bearing?", "a": "A 6210-NTN deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6210-NTN need?", "a": "The open 6210-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6210?", "a": "NTN lists the open 6210 under the bare designation 6210; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 50 mm bore envelope." }, { "q": "Does NTN offer 6210 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6210 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6210", "6210-NTN" ], "locale_variants": {} }, { "sku": "6210-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6210LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.82, "limiting_speed_rpm": 4700, "max_rpm": 4700, "weight_g": 454, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6210LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6210 with C3 for those conditions.", "At 50 mm bore the 62xx light series is the workhorse section; its 90×20 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6210-2RS-NTN runs slower and cooler-limited than the open 6210; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6210-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6210LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 50 mm bore puts 6210 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "NTN lists the grease limiting speed at 4700 r/min for 6210; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6210 at 39 kN dynamic (C) and 23.2 kN static (C0), 1.82 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 454 g, 6210 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 50×90×20 mm envelope of 6210 gives a D/d ratio of 1.80 and 20.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 39/23.2 kN load ratings, 1.82 kN fatigue load limit Cu NTN lists the grease limiting speed at 4700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 454 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6210LLU on the 50×90×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6210 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6210-2RS-NTN bearing?", "a": "A 6210-2RS-NTN deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6210-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6210-2RS-NTN need?", "a": "6210-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6210 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6210?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6210LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×90×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 6210 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6210LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6210-llu", "6210llu", "6210-2RS", "6210-2rs", "6210LLU", "6210-2RS-NTN" ], "locale_variants": {} }, { "sku": "6210-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6210LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.82, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 454, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6210-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 90 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6210LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6210 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "The low-drag lip of 6210-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6210-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues this low-friction non-contact seal as 6210LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 50 mm bore puts 6210 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5700 r/min the grease limiting speed for 6210 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6210 at 39 kN dynamic (C) and 23.2 kN static (C0), 1.82 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 454 g, 6210 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 50×90×20 mm envelope of 6210 gives a D/d ratio of 1.80 and 20.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 39/23.2 kN load ratings, 1.82 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 454 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6210LLB on the 50×90×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6210 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6210 is listed." ], "faq": [ { "q": "What are the dimensions of a 6210-RSR-NTN bearing?", "a": "A 6210-RSR-NTN deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6210-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6210?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6210LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×90×20 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6210LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6210-llb", "6210llb", "6210-RSR", "6210-rsr", "6210LLB", "6210-RSR-NTN" ], "locale_variants": {} }, { "sku": "6210-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6210ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.82, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 454, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6210ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6210 with C3 for those conditions.", "At 50 mm bore the 62xx light series is the workhorse section; its 90×20 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6210-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6210-2RS for that.", "Shielded 6210-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6210-ZZ-NTN.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 6210-ZZ-NTN drags the lip and overheats it.", "NTN catalogues the shielded version as 6210ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 50 mm bore puts 6210 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5700 r/min the grease limiting speed for 6210 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6210 at 39 kN dynamic (C) and 23.2 kN static (C0), 1.82 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 454 g, 6210 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 50×90×20 mm envelope of 6210 gives a D/d ratio of 1.80 and 20.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 39/23.2 kN load ratings, 1.82 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 454 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6210ZZ on the 50×90×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6210 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6210-ZZ-NTN bearing?", "a": "A 6210-ZZ-NTN deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "Are 6210 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6210 uses the same ISO 15 envelope (50×90×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6210?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6210ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×90×20 mm ISO 15 envelope." }, { "q": "Is 6210ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6210-zz", "6210zz", "6210-ZZ", "6210ZZ", "6210-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6310-NTN", "brand": "NTN", "manufacturer_designation": "6310", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 68.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 2.99, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6310 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 110 mm outside diameter and 27 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6310 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium section at 50 mm bore gains dynamic rating through larger rolling elements on a 110 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.", "The open 6310-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 50×110×27 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6310-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6310-NTN.", "The open 6310 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 50 mm bore puts 6310 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 6400 r/min the grease limiting speed for 6310 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6310 at 68.5 kN dynamic (C) and 38.5 kN static (C0), 2.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6310 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 50×110×27 mm envelope of 6310 gives a D/d ratio of 2.20 and 30.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 68.5/38.5 kN load ratings, 2.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6310 on the 50×110×27 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6310 in a rated drive.", "Order the C3 internal-clearance version (6310 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6310-NTN bearing?", "a": "A 6310-NTN deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6310 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6310 uses the same ISO 15 envelope (50×110×27 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6310-NTN have?", "a": "Unless a clearance suffix says otherwise, 6310-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6310 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6310?", "a": "NTN lists the open 6310 under the bare designation 6310; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 50 mm bore envelope." }, { "q": "Does NTN offer 6310 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6310 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "full", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "full", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "310", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6310", "6310-NTN" ], "locale_variants": {} }, { "sku": "6310-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6310LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 68.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 2.99, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6310LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6310 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 50 mm bore gains dynamic rating through larger rolling elements on a 110 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6310-2RS-NTN runs slower and cooler-limited than the open 6310; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6310-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6310-2RS-NTN.", "NTN catalogues the contact-sealed version as 6310LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 50 mm bore puts 6310 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "NTN lists the grease limiting speed at 4200 r/min for 6310; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6310 at 68.5 kN dynamic (C) and 38.5 kN static (C0), 2.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6310 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 50×110×27 mm envelope of 6310 gives a D/d ratio of 2.20 and 30.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 68.5/38.5 kN load ratings, 2.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 4200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6310LLU on the 50×110×27 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6310 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6310 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6310-2RS-NTN bearing?", "a": "A 6310-2RS-NTN deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6310-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 50 mm bore?", "a": "The '3' is the medium diameter series: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN suffix for a sealed 6310?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6310LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×110×27 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6310LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "full", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "310", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6310-llu", "6310llu", "6310-2RS", "6310-2rs", "6310LLU", "6310-2RS-NTN" ], "locale_variants": {} }, { "sku": "6310-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6310LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 68.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 2.99, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6310LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.", "The 63xx medium section at 50 mm bore gains dynamic rating through larger rolling elements on a 110 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.", "The low-drag lip of 6310-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6310-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6310-RSR-NTN.", "NTN catalogues this low-friction non-contact seal as 6310LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 50 mm bore puts 6310 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5000 r/min the grease limiting speed for 6310 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6310 at 68.5 kN dynamic (C) and 38.5 kN static (C0), 2.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6310 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 50×110×27 mm envelope of 6310 gives a D/d ratio of 2.20 and 30.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 68.5/38.5 kN load ratings, 2.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 5000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6310LLB on the 50×110×27 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6310 in a rated drive.", "Order the C3 internal-clearance version (6310 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6310 is listed." ], "faq": [ { "q": "What are the dimensions of a 6310-RSR-NTN bearing?", "a": "A 6310-RSR-NTN deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6310-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6310-RSR-NTN need?", "a": "6310-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6310 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6310?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6310LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×110×27 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6310LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "full", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "310", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6310-llb", "6310llb", "6310-RSR", "6310-rsr", "6310LLB", "6310-RSR-NTN" ], "locale_variants": {} }, { "sku": "6310-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6310ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 68.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 2.99, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6310ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6310 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 50 mm bore gains dynamic rating through larger rolling elements on a 110 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6310-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6310-2RS for that.", "Shielded 6310-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6310ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 50 mm bore puts 6310 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5000 r/min the grease limiting speed for 6310 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6310 at 68.5 kN dynamic (C) and 38.5 kN static (C0), 2.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6310 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 50×110×27 mm envelope of 6310 gives a D/d ratio of 2.20 and 30.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 68.5/38.5 kN load ratings, 2.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 5000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6310ZZ on the 50×110×27 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6310 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6310 is listed." ], "faq": [ { "q": "What are the dimensions of a 6310-ZZ-NTN bearing?", "a": "A 6310-ZZ-NTN deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6310-ZZ-NTN need?", "a": "6310-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6310 bore code work?", "a": "The last two digits of 6310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6310?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6310ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×110×27 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6310ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "full", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "310", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6310-zz", "6310zz", "6310-ZZ", "6310ZZ", "6310-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6410-NTN", "brand": "NTN", "manufacturer_designation": "6410", "series": "6400-series", "type": "deep_groove", "d_mm": 50, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.85, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 1880, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6410 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 130 mm outside diameter and 31 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6410 with C3 clearance and re-check the residual value after mounting.", "The 64xx heavy section at 50 mm bore (130 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6410-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 50×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6410 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6410-NTN.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6410 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 50 mm bore puts 6410 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5700 r/min the grease limiting speed for 6410 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 92 kN dynamic load rating (C) and 49.5 kN static (C0), 3.85 kN fatigue load limit Cu, 6410 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1880 g (1.9 kg), 6410 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 50×130×31 mm envelope of 6410 gives a D/d ratio of 2.60 and 40.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 92/49.5 kN load ratings, 3.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1880 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6410 on the 50×130×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6410 in a rated drive.", "Standard catalogue stock of 6410 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6410 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6410-NTN bearing?", "a": "A 6410-NTN deep-groove ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6400 compare with other series at the same 50 mm bore?", "a": "The '4' is the heavy diameter series: 130×31 mm, 40.0 mm radial section at 50 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6410 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6410 uses the same ISO 15 envelope (50×130×31 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6410?", "a": "NTN lists the open 6410 under the bare designation 6410; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 50 mm bore envelope." }, { "q": "What cage does NTN fit in 6410?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6410-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6410", "equiv_brand": "SKF", "level": "full", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6410", "6410-NTN" ], "locale_variants": {} }, { "sku": "6410-ZZ", "brand": "NTN", "manufacturer_designation": "6410ZZ", "series": "6400-series", "type": "deep_groove", "d_mm": 50, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.85, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 1880, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6410ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6410 against the shaft shoulder while it cools so the ring cannot creep back.", "The 64xx heavy section at 50 mm bore exists for high radial load at moderate rpm; its 130 mm OD and 31 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "ZZ shields are non-contact: 6410-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6410-2RS for that.", "Do not wash 6410-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6410ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 50 mm bore puts 6410 in NTN's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty, but for continuous high-speed use specify the LLH low-torque seal (not LLU) and confirm the housing allows the listed limiting speed.", "At 5700 r/min the grease limiting speed for 6410 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 92 kN dynamic load rating (C) and 49.5 kN static (C0), 3.85 kN fatigue load limit Cu, 6410 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1880 g (1.9 kg), 6410 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 50×130×31 mm envelope of 6410 gives a D/d ratio of 2.60 and 40.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 92/49.5 kN load ratings, 3.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1880 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6410ZZ on the 50×130×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6410 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6410 is listed." ], "faq": [ { "q": "What are the dimensions of a 6410-ZZ bearing?", "a": "A 6410-ZZ deep-groove ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6410-ZZ need?", "a": "6410-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6410 bore code work?", "a": "The last two digits of 6410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6410?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6410ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 50×130×31 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6410ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6410-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6410", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6410-zz", "6410zz", "6410-ZZ", "6410ZZ" ], "locale_variants": {} }, { "sku": "61811-NTN", "brand": "NTN", "manufacturer_designation": "6811JR", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.75, "static_load_kN": 8.1, "fatigue_load_limit_kN": 0.54, "limiting_speed_rpm": 8700, "max_rpm": 8700, "weight_g": 83, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61811 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 72 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61811 against the shaft shoulder while it cools so the ring cannot creep back.", "Only 8.5 mm of radial section separates bore and OD on the 618xx series at 55 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6211.", "The open 61811-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 55×72×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61811-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 61811-NTN and shows up later as two-point loaded raceway wear.", "The open 61811 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 55 mm bore 61811 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 8700 r/min the grease limiting speed for 61811 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61811 at 9.75 kN dynamic (C) and 8.1 kN static (C0), 0.54 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 83 g, 61811 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 55×72×9 mm envelope of 61811 gives a D/d ratio of 1.31 and only 8.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 9.75/8.1 kN load ratings, 0.54 kN fatigue load limit Cu NTN lists the grease limiting speed at 8700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 83 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6811JR on the 55×72×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61811 in a rated drive.", "Standard catalogue stock of 61811 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61811 is listed." ], "faq": [ { "q": "What are the dimensions of a 61811-NTN bearing?", "a": "A 61811-NTN deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61811 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61811 uses the same ISO 15 envelope (55×72×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61811-NTN have?", "a": "Unless a clearance suffix says otherwise, 61811-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61811 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61811?", "a": "NTN lists the open 61811 under the bare designation 6811JR; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 55 mm bore envelope." }, { "q": "Does NTN offer 61811 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6811JR is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61811-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811", "equiv_brand": "SKF", "level": "full", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6811jr", "61811", "6811JR", "61811-NTN" ], "locale_variants": {} }, { "sku": "61811-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6811JRLLU", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.75, "static_load_kN": 8.1, "fatigue_load_limit_kN": 0.54, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 83, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61811-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 72 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6811JRLLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61811 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "Contact seals add drag and heat: 61811-2RS-NTN runs slower and cooler-limited than the open 61811; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61811-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 61811-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 61811-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6811JRLLU (suffix RLLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 55 mm bore 61811 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61811; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61811 at 9.75 kN dynamic (C) and 8.1 kN static (C0), 0.54 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 83 g, 61811 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 55×72×9 mm envelope of 61811 gives a D/d ratio of 1.31 and only 8.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 9.75/8.1 kN load ratings, 0.54 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 83 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6811JRLLU on the 55×72×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61811 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61811-2RS-NTN bearing?", "a": "A 61811-2RS-NTN deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61811 bore code work?", "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61811-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 61811?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6811JRLLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×72×9 mm ISO 15 envelope." }, { "q": "Does NTN offer 61811 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6811JRLLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61811-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61811-llu", "6811jrllu", "6811llu", "61811-2RS", "61811-2rs", "6811JRLLU", "61811-2RS-NTN" ], "locale_variants": {} }, { "sku": "61811-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6811JRLLB", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.75, "static_load_kN": 8.1, "fatigue_load_limit_kN": 0.54, "limiting_speed_rpm": 8700, "max_rpm": 8700, "weight_g": 83, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61811-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 72 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6811JRLLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61811 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "The low-drag lip of 61811-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61811-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61811-RSR-NTN.", "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues this low-friction non-contact seal as 6811JRLLB (suffix RLLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 55 mm bore 61811 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 8700 r/min the grease limiting speed for 61811 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61811 at 9.75 kN dynamic (C) and 8.1 kN static (C0), 0.54 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 83 g, 61811 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 55×72×9 mm envelope of 61811 gives a D/d ratio of 1.31 and only 8.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 9.75/8.1 kN load ratings, 0.54 kN fatigue load limit Cu NTN lists the grease limiting speed at 8700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 83 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6811JRLLB on the 55×72×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61811 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61811 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61811-RSR-NTN bearing?", "a": "A 61811-RSR-NTN deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 61811-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61811-RSR-NTN need?", "a": "61811-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61811 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61811?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6811JRLLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×72×9 mm ISO 15 envelope." }, { "q": "Is 6811JRLLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61811-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61811-llb", "6811jrllb", "6811llb", "61811-RSR", "61811-rsr", "6811JRLLB", "61811-RSR-NTN" ], "locale_variants": {} }, { "sku": "61811-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6811JRZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.75, "static_load_kN": 8.1, "fatigue_load_limit_kN": 0.54, "limiting_speed_rpm": 8700, "max_rpm": 8700, "weight_g": 83, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6811JRZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61811 with C3 clearance and re-check the residual value after mounting.", "Only 8.5 mm of radial section separates bore and OD on the 618xx series at 55 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6211.", "ZZ shields are non-contact: 61811-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61811-2RS for that.", "Shielded 61811-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61811-ZZ-NTN.", "NTN catalogues the shielded version as 6811JRZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 55 mm bore 61811 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 8700 r/min the grease limiting speed for 61811 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61811 at 9.75 kN dynamic (C) and 8.1 kN static (C0), 0.54 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 83 g, 61811 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 55×72×9 mm envelope of 61811 gives a D/d ratio of 1.31 and only 8.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 9.75/8.1 kN load ratings, 0.54 kN fatigue load limit Cu NTN lists the grease limiting speed at 8700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 83 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6811JRZZ on the 55×72×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61811 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61811 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61811-ZZ-NTN bearing?", "a": "A 61811-ZZ-NTN deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61811 bore code work?", "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61811-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 61811?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6811JRZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×72×9 mm ISO 15 envelope." }, { "q": "Does NTN offer 61811 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6811JRZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61811-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61811-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61811-zz", "6811jrzz", "6811zz", "61811-ZZ", "6811JRZZ", "61811-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61911-NTN", "brand": "NTN", "manufacturer_designation": "6911", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.7, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.92, "limiting_speed_rpm": 8200, "max_rpm": 8200, "weight_g": 180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61911 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61911-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 55×80×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61911-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61911-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61911 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 55 mm bore 61911 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 8200 r/min the grease limiting speed for 61911 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 17.7 kN dynamic load rating (C) and 13.3 kN static (C0), 0.92 kN fatigue load limit Cu, 61911 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 180 g, 61911 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 55×80×13 mm envelope of 61911 gives a D/d ratio of 1.45 and 12.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 17.7/13.3 kN load ratings, 0.92 kN fatigue load limit Cu NTN lists the grease limiting speed at 8200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6911 on the 55×80×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61911 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61911 is listed.", "Standard catalogue stock of 61911 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61911-NTN bearing?", "a": "A 61911-NTN deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61911-NTN have?", "a": "Unless a clearance suffix says otherwise, 61911-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61911 and verify the residual clearance after mounting." }, { "q": "How should 61911-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61911?", "a": "NTN lists the open 61911 under the bare designation 6911; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 55 mm bore envelope." }, { "q": "Does NTN offer 61911 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6911 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61911-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911", "equiv_brand": "SKF", "level": "full", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6911", "61911", "61911-NTN" ], "locale_variants": {} }, { "sku": "61911-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6911LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.7, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.92, "limiting_speed_rpm": 4600, "max_rpm": 4600, "weight_g": 180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6911LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.", "The 619xx thin section at 55 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61911-2RS-NTN runs slower and cooler-limited than the open 61911; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61911-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the contact-sealed version as 6911LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 55 mm bore 61911 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4600 r/min for 61911; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 17.7 kN dynamic load rating (C) and 13.3 kN static (C0), 0.92 kN fatigue load limit Cu, 61911 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 180 g, 61911 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 55×80×13 mm envelope of 61911 gives a D/d ratio of 1.45 and 12.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 17.7/13.3 kN load ratings, 0.92 kN fatigue load limit Cu NTN lists the grease limiting speed at 4600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6911LLU on the 55×80×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61911 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61911-2RS-NTN bearing?", "a": "A 61911-2RS-NTN deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61911-2RS-NTN need?", "a": "61911-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61911 with a housing grease fitting instead." }, { "q": "How does the 61911 bore code work?", "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61911?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6911LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×80×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61911 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6911LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61911-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61911-llu", "6911llu", "61911-2RS", "61911-2rs", "6911LLU", "61911-2RS-NTN" ], "locale_variants": {} }, { "sku": "61911-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6911LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.7, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.92, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6911LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61911 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section at 55 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61911-RSR-NTN run faster than contact-seal 61911-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61911-2RS instead.", "The non-contact lip of 61911-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 61911-RSR-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues this low-friction non-contact seal as 6911LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 55 mm bore 61911 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5500 r/min the grease limiting speed for 61911 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 17.7 kN dynamic load rating (C) and 13.3 kN static (C0), 0.92 kN fatigue load limit Cu, 61911 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 180 g, 61911 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 55×80×13 mm envelope of 61911 gives a D/d ratio of 1.45 and 12.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 17.7/13.3 kN load ratings, 0.92 kN fatigue load limit Cu NTN lists the grease limiting speed at 5500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6911LLB on the 55×80×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61911 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61911 is listed." ], "faq": [ { "q": "What are the dimensions of a 61911-RSR-NTN bearing?", "a": "A 61911-RSR-NTN deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61911-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 55 mm bore?", "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61911?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6911LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×80×13 mm ISO 15 envelope." }, { "q": "Is 6911LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61911-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61911-llb", "6911llb", "61911-RSR", "61911-rsr", "6911LLB", "61911-RSR-NTN" ], "locale_variants": {} }, { "sku": "61911-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6911ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.7, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.92, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6911ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61911 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 55 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61911-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61911-2RS for that.", "Do not wash 61911-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61911-ZZ-NTN drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6911ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 55 mm bore 61911 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5500 r/min the grease limiting speed for 61911 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 17.7 kN dynamic load rating (C) and 13.3 kN static (C0), 0.92 kN fatigue load limit Cu, 61911 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 180 g, 61911 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 55×80×13 mm envelope of 61911 gives a D/d ratio of 1.45 and 12.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 17.7/13.3 kN load ratings, 0.92 kN fatigue load limit Cu NTN lists the grease limiting speed at 5500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6911ZZ on the 55×80×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61911 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61911 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61911-ZZ-NTN bearing?", "a": "A 61911-ZZ-NTN deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61911-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61911-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61911 and verify the residual clearance after mounting." }, { "q": "How should 61911-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61911?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6911ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×80×13 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6911ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61911-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61911-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61911-zz", "6911zz", "61911-ZZ", "6911ZZ", "61911-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16011-NTN", "brand": "NTN", "manufacturer_designation": "16011", "series": "16000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.6, "static_load_kN": 15.3, "fatigue_load_limit_kN": 1.06, "limiting_speed_rpm": 7700, "max_rpm": 7700, "weight_g": 258, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16011 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 16011 against the shaft shoulder while it cools so the ring cannot creep back.", "The 160xx narrow section at 55 mm bore shares the 90 mm outside diameter of the 6011 but is only 11 mm wide; a 6011 in an 11 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16011-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 55×90×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16011-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 11 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 16011 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 55 mm bore 16011 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7700 r/min the grease limiting speed for 16011 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 20.6 kN dynamic load rating (C) and 15.3 kN static (C0), 1.06 kN fatigue load limit Cu, 16011 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 258 g, 16011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 55×90×11 mm envelope of 16011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 20.6/15.3 kN load ratings, 1.06 kN fatigue load limit Cu NTN lists the grease limiting speed at 7700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 258 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16011 on the 55×90×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16011 in a rated drive.", "Order the C3 internal-clearance version (16011 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 16011 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16011-NTN bearing?", "a": "A 16011-NTN deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 11 mm width (2.165 × 3.543 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 16011 mean?", "a": "A bare 16011 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 55 mm bore?", "a": "160 is the narrow extra-light section: 90×11 mm with a 17.5 mm radial section at 55 mm bore. It has the same bore and outside diameter as the 6011 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN order number for an open 16011?", "a": "NTN lists the open 16011 under the bare designation 16011; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 55 mm bore envelope." }, { "q": "Does NTN offer 16011 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16011 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "16011", "equiv_brand": "FAG", "level": "full", "note": "Same 55×90×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16011", "16011-NTN" ], "locale_variants": {} }, { "sku": "6011-NTN", "brand": "NTN", "manufacturer_designation": "6011", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 31.5, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.62, "limiting_speed_rpm": 7700, "max_rpm": 7700, "weight_g": 388, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6011 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6011-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6011 units.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6011 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 55 mm bore 6011 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7700 r/min the grease limiting speed for 6011 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 31.5 kN dynamic load rating (C) and 21.2 kN static (C0), 1.62 kN fatigue load limit Cu, 6011 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 388 g, 6011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 55×90×18 mm envelope of 6011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 31.5/21.2 kN load ratings, 1.62 kN fatigue load limit Cu NTN lists the grease limiting speed at 7700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 388 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6011 on the 55×90×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6011 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6011 is listed.", "Order the C3 internal-clearance version (6011 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6011-NTN bearing?", "a": "A 6011-NTN deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6011-NTN need?", "a": "The open 6011-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6011?", "a": "NTN lists the open 6011 under the bare designation 6011; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 55 mm bore envelope." }, { "q": "Does NTN offer 6011 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6011 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6011-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011", "equiv_brand": "SKF", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6011", "6011-NTN" ], "locale_variants": {} }, { "sku": "6011-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6011LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 31.5, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.62, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 388, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6011LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6011 against the shaft shoulder while it cools so the ring cannot creep back.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6011-2RS-NTN runs slower and cooler-limited than the open 6011; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6011-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6011-2RS-NTN.", "NTN catalogues the contact-sealed version as 6011LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 55 mm bore 6011 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 6011; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 31.5 kN dynamic load rating (C) and 21.2 kN static (C0), 1.62 kN fatigue load limit Cu, 6011 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 388 g, 6011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 55×90×18 mm envelope of 6011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 31.5/21.2 kN load ratings, 1.62 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 388 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6011LLU on the 55×90×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6011 in a rated drive.", "Standard catalogue stock of 6011 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6011-2RS-NTN bearing?", "a": "A 6011-2RS-NTN deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6011-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6011?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6011LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×90×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 6011 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6011LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6011-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6011-llu", "6011llu", "6011-2RS", "6011-2rs", "6011LLU", "6011-2RS-NTN" ], "locale_variants": {} }, { "sku": "6011-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6011LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 31.5, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.62, "limiting_speed_rpm": 7700, "max_rpm": 7700, "weight_g": 388, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6011-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6011LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The low-drag lip of 6011-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6011-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6011-RSR-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6011LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 55 mm bore 6011 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7700 r/min the grease limiting speed for 6011 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 31.5 kN dynamic load rating (C) and 21.2 kN static (C0), 1.62 kN fatigue load limit Cu, 6011 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 388 g, 6011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 55×90×18 mm envelope of 6011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 31.5/21.2 kN load ratings, 1.62 kN fatigue load limit Cu NTN lists the grease limiting speed at 7700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 388 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6011LLB on the 55×90×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6011 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6011-RSR-NTN bearing?", "a": "A 6011-RSR-NTN deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6000 compare with other series at the same 55 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6011 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6011 uses the same ISO 15 envelope (55×90×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6011?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6011LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×90×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 6011 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6011LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6011-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6011-llb", "6011llb", "6011-RSR", "6011-rsr", "6011LLB", "6011-RSR-NTN" ], "locale_variants": {} }, { "sku": "6011-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6011ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 31.5, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.62, "limiting_speed_rpm": 7700, "max_rpm": 7700, "weight_g": 388, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6011-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6011ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "Choosing the 60xx extra-light section saves radial space at 55 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6211 before committing to the smaller envelope.", "ZZ shields are non-contact: 6011-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6011-2RS for that.", "Shielded 6011-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6011-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6011ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 55 mm bore 6011 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7700 r/min the grease limiting speed for 6011 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 31.5 kN dynamic load rating (C) and 21.2 kN static (C0), 1.62 kN fatigue load limit Cu, 6011 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 388 g, 6011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 55×90×18 mm envelope of 6011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 31.5/21.2 kN load ratings, 1.62 kN fatigue load limit Cu NTN lists the grease limiting speed at 7700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 388 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6011ZZ on the 55×90×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6011 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6011 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6011-ZZ-NTN bearing?", "a": "A 6011-ZZ-NTN deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6011-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6011-ZZ-NTN need?", "a": "6011-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 6011?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6011ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×90×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6011ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6011-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6011-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6011-zz", "6011zz", "6011-ZZ", "6011ZZ", "6011-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6211-NTN", "brand": "NTN", "manufacturer_designation": "6211", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48, "static_load_kN": 29.2, "fatigue_load_limit_kN": 2.29, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 601, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6211 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 100 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6211 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6211-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6211 units.", "Never mix components between two 6211-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6211 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 55 mm bore 6211 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6400 r/min the grease limiting speed for 6211 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6211 at 48 kN dynamic (C) and 29.2 kN static (C0), 2.29 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 601 g, 6211 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 55×100×21 mm envelope of 6211 gives a D/d ratio of 1.82 and 22.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 48/29.2 kN load ratings, 2.29 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 601 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6211 on the 55×100×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6211 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6211 is listed.", "Standard catalogue stock of 6211 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6211-NTN bearing?", "a": "A 6211-NTN deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "Are 6211 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6211 uses the same ISO 15 envelope (55×100×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6211?", "a": "NTN lists the open 6211 under the bare designation 6211; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 55 mm bore envelope." }, { "q": "What cage does NTN fit in 6211?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6211", "6211-NTN" ], "locale_variants": {} }, { "sku": "6211-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6211LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48, "static_load_kN": 29.2, "fatigue_load_limit_kN": 2.29, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 601, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6211-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 100 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6211LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6211-2RS-NTN runs slower and cooler-limited than the open 6211; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6211-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "The housing bore for the 100 mm OD should be round within IT7; an oval bore pinches the outer ring of 6211-2RS-NTN and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 21 mm-wide ring of 6211-2RS-NTN drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6211LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 55 mm bore 6211 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 6211; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6211 at 48 kN dynamic (C) and 29.2 kN static (C0), 2.29 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 601 g, 6211 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 55×100×21 mm envelope of 6211 gives a D/d ratio of 1.82 and 22.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 48/29.2 kN load ratings, 2.29 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 601 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6211LLU on the 55×100×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6211 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6211-2RS-NTN bearing?", "a": "A 6211-2RS-NTN deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6211-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6211-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6211 and verify the residual clearance after mounting." }, { "q": "How should 6211-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6211?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6211LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×100×21 mm ISO 15 envelope." }, { "q": "Does NTN offer 6211 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6211LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6211-llu", "6211llu", "6211-2RS", "6211-2rs", "6211LLU", "6211-2RS-NTN" ], "locale_variants": {} }, { "sku": "6211-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6211LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48, "static_load_kN": 29.2, "fatigue_load_limit_kN": 2.29, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 601, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6211-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 100 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6211LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "At 55 mm bore the 62xx light series is the workhorse section; its 100×21 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6211-RSR-NTN run faster than contact-seal 6211-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6211-2RS instead.", "The non-contact lip of 6211-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6211LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 55 mm bore 6211 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6400 r/min the grease limiting speed for 6211 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6211 at 48 kN dynamic (C) and 29.2 kN static (C0), 2.29 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 601 g, 6211 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 55×100×21 mm envelope of 6211 gives a D/d ratio of 1.82 and 22.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 48/29.2 kN load ratings, 2.29 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 601 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6211LLB on the 55×100×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6211 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6211 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6211-RSR-NTN bearing?", "a": "A 6211-RSR-NTN deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6211-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6211?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6211LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×100×21 mm ISO 15 envelope." }, { "q": "Does NTN offer 6211 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6211LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6211-llb", "6211llb", "6211-RSR", "6211-rsr", "6211LLB", "6211-RSR-NTN" ], "locale_variants": {} }, { "sku": "6211-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6211ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48, "static_load_kN": 29.2, "fatigue_load_limit_kN": 2.29, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 601, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6211ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "Do not wash 6211-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6211-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6211ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 55 mm bore 6211 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6400 r/min the grease limiting speed for 6211 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6211 at 48 kN dynamic (C) and 29.2 kN static (C0), 2.29 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 601 g, 6211 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 55×100×21 mm envelope of 6211 gives a D/d ratio of 1.82 and 22.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 48/29.2 kN load ratings, 2.29 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 601 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6211ZZ on the 55×100×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6211 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6211-ZZ-NTN bearing?", "a": "A 6211-ZZ-NTN deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6211 bore code work?", "a": "The last two digits of 6211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6211-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 6211?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6211ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×100×21 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6211ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6211-zz", "6211zz", "6211-ZZ", "6211ZZ", "6211-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6311-NTN", "brand": "NTN", "manufacturer_designation": "6311", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 79.5, "static_load_kN": 45, "fatigue_load_limit_kN": 3.5, "limiting_speed_rpm": 5800, "max_rpm": 5800, "weight_g": 1370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6311 with C3 for those conditions.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "The open 6311-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 55×120×29 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6311 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6311-NTN.", "Never mix components between two 6311-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6311 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 55 mm bore 6311 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5800 r/min the grease limiting speed for 6311 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 79.5 kN dynamic load rating (C) and 45 kN static (C0), 3.5 kN fatigue load limit Cu, 6311 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1370 g (1.4 kg), 6311 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 55×120×29 mm envelope of 6311 gives a D/d ratio of 2.18 and 32.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 79.5/45 kN load ratings, 3.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 5800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1370 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6311 on the 55×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6311 in a rated drive.", "Order the C3 internal-clearance version (6311 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6311-NTN bearing?", "a": "A 6311-NTN deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6311-NTN have?", "a": "Unless a clearance suffix says otherwise, 6311-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6311 and verify the residual clearance after mounting." }, { "q": "How should 6311-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6311?", "a": "NTN lists the open 6311 under the bare designation 6311; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 55 mm bore envelope." }, { "q": "Is 6311 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "311", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6311", "6311-NTN" ], "locale_variants": {} }, { "sku": "6311-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6311LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 79.5, "static_load_kN": 45, "fatigue_load_limit_kN": 3.5, "limiting_speed_rpm": 3900, "max_rpm": 3900, "weight_g": 1370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6311LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6311 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6311-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6311-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 120 mm OD should be round within IT7; an oval bore pinches the outer ring of 6311-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6311LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 55 mm bore 6311 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3900 r/min for 6311; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 79.5 kN dynamic load rating (C) and 45 kN static (C0), 3.5 kN fatigue load limit Cu, 6311 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1370 g (1.4 kg), 6311 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 55×120×29 mm envelope of 6311 gives a D/d ratio of 2.18 and 32.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 79.5/45 kN load ratings, 3.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 3900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1370 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6311LLU on the 55×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6311 in a rated drive.", "Order the C3 internal-clearance version (6311 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6311-2RS-NTN bearing?", "a": "A 6311-2RS-NTN deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6311-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6311-2RS-NTN need?", "a": "6311-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6311 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6311?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6311LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×120×29 mm ISO 15 envelope." }, { "q": "Does NTN offer 6311 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6311LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "311", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6311-llu", "6311llu", "6311-2RS", "6311-2rs", "6311LLU", "6311-2RS-NTN" ], "locale_variants": {} }, { "sku": "6311-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6311LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 79.5, "static_load_kN": 45, "fatigue_load_limit_kN": 3.5, "limiting_speed_rpm": 5800, "max_rpm": 5800, "weight_g": 1370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6311-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 120 mm outside diameter and 29 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6311LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6311 with C3 for those conditions.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "The low-drag lip of 6311-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6311-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 120 mm OD should be round within IT7; an oval bore pinches the outer ring of 6311-RSR-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues this low-friction non-contact seal as 6311LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 55 mm bore 6311 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5800 r/min the grease limiting speed for 6311 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 79.5 kN dynamic load rating (C) and 45 kN static (C0), 3.5 kN fatigue load limit Cu, 6311 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1370 g (1.4 kg), 6311 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 55×120×29 mm envelope of 6311 gives a D/d ratio of 2.18 and 32.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 79.5/45 kN load ratings, 3.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 5800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1370 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6311LLB on the 55×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6311 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 6311 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6311-RSR-NTN bearing?", "a": "A 6311-RSR-NTN deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6311 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6311 uses the same ISO 15 envelope (55×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6311?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6311LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×120×29 mm ISO 15 envelope." }, { "q": "Is 6311LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "311", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6311-llb", "6311llb", "6311-RSR", "6311-rsr", "6311LLB", "6311-RSR-NTN" ], "locale_variants": {} }, { "sku": "6311-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6311ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 79.5, "static_load_kN": 45, "fatigue_load_limit_kN": 3.5, "limiting_speed_rpm": 5800, "max_rpm": 5800, "weight_g": 1370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6311-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 120 mm outside diameter and 29 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6311ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6311 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.", "Do not wash 6311-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6311-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6311-ZZ-NTN.", "NTN catalogues the shielded version as 6311ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 55 mm bore 6311 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5800 r/min the grease limiting speed for 6311 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 79.5 kN dynamic load rating (C) and 45 kN static (C0), 3.5 kN fatigue load limit Cu, 6311 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1370 g (1.4 kg), 6311 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 55×120×29 mm envelope of 6311 gives a D/d ratio of 2.18 and 32.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 79.5/45 kN load ratings, 3.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 5800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1370 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6311ZZ on the 55×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6311 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6311-ZZ-NTN bearing?", "a": "A 6311-ZZ-NTN deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6311-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6311-ZZ-NTN need?", "a": "6311-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 6311?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6311ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×120×29 mm ISO 15 envelope." }, { "q": "Is 6311ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "full", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "311", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6311-zz", "6311zz", "6311-ZZ", "6311ZZ", "6311-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6411-NTN", "brand": "NTN", "manufacturer_designation": "6411", "series": "6400-series", "type": "deep_groove", "d_mm": 55, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 54, "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 5200, "max_rpm": 5200, "weight_g": 2290, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6411 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6411 with C3 clearance and re-check the residual value after mounting.", "The 64xx heavy section at 55 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6411-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 55×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6411-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6400-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6411 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 55 mm bore 6411 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5200 r/min the grease limiting speed for 6411 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 98.5 kN dynamic load rating (C) and 54 kN static (C0), 4.2 kN fatigue load limit Cu, 6411 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2290 g (2.3 kg), 6411 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 55×140×33 mm envelope of 6411 gives a D/d ratio of 2.55 and 42.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 98.5/54 kN load ratings, 4.2 kN fatigue load limit Cu NTN lists the grease limiting speed at 5200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2290 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6411 on the 55×140×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6411 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6411-NTN bearing?", "a": "A 6411-NTN deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6411 mean?", "a": "A bare 6411 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 55 mm bore?", "a": "The '4' is the heavy diameter series: 140×33 mm, 42.5 mm radial section at 55 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN order number for an open 6411?", "a": "NTN lists the open 6411 under the bare designation 6411; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 55 mm bore envelope." }, { "q": "Does NTN offer 6411 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6411 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6411-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6411-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6411", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6411", "6411-NTN" ], "locale_variants": {} }, { "sku": "6411-ZZ", "brand": "NTN", "manufacturer_designation": "6411ZZ", "series": "6400-series", "type": "deep_groove", "d_mm": 55, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 98.5, "static_load_kN": 54, "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 5200, "max_rpm": 5200, "weight_g": 2290, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6411-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6411ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6411 with C3 clearance and re-check the residual value after mounting.", "The 64xx heavy section at 55 mm bore exists for high radial load at moderate rpm; its 140 mm OD and 33 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "ZZ shields are non-contact: 6411-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6411-2RS for that.", "Do not wash 6411-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 33 mm-wide ring of 6411-ZZ drags the lip and overheats it.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6411ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 55 mm bore 6411 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5200 r/min the grease limiting speed for 6411 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 98.5 kN dynamic load rating (C) and 54 kN static (C0), 4.2 kN fatigue load limit Cu, 6411 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2290 g (2.3 kg), 6411 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 55×140×33 mm envelope of 6411 gives a D/d ratio of 2.55 and 42.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 98.5/54 kN load ratings, 4.2 kN fatigue load limit Cu NTN lists the grease limiting speed at 5200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2290 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6411ZZ on the 55×140×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6411 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6411-ZZ bearing?", "a": "A 6411-ZZ deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6400 compare with other series at the same 55 mm bore?", "a": "The '4' is the heavy diameter series: 140×33 mm, 42.5 mm radial section at 55 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6411 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6411 uses the same ISO 15 envelope (55×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6411?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6411ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 55×140×33 mm ISO 15 envelope." }, { "q": "Is 6411ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6411-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6411-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6411", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6411-zz", "6411zz", "6411-ZZ", "6411ZZ" ], "locale_variants": {} }, { "sku": "61812-NTN", "brand": "NTN", "manufacturer_designation": "6812", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 10.6, "fatigue_load_limit_kN": 0.7, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 106, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.", "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "The open 61812-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 60×78×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61812-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61812 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 60 mm bore 61812 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 8000 r/min the grease limiting speed for 61812 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61812 at 12.7 kN dynamic (C) and 10.6 kN static (C0), 0.7 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 106 g, 61812 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 60×78×10 mm envelope of 61812 gives a D/d ratio of 1.30 and only 9.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 12.7/10.6 kN load ratings, 0.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 8000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 106 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6812 on the 60×78×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61812 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61812 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61812-NTN bearing?", "a": "A 61812-NTN deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61812-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61812-NTN need?", "a": "The open 61812-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61812?", "a": "NTN lists the open 61812 under the bare designation 6812; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 60 mm bore envelope." }, { "q": "What cage does NTN fit in 6812?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61812-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812", "equiv_brand": "SKF", "level": "full", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6812", "61812", "61812-NTN" ], "locale_variants": {} }, { "sku": "61812-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6812LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 10.6, "fatigue_load_limit_kN": 0.7, "limiting_speed_rpm": 4400, "max_rpm": 4400, "weight_g": 106, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61812-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 78 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6812LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61812 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "Contact seals add drag and heat: 61812-2RS-NTN runs slower and cooler-limited than the open 61812; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61812-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Vibration during standstill brinells the raceways of a 60 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Never mix components between two 61812-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the contact-sealed version as 6812LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 60 mm bore 61812 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4400 r/min for 61812; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61812 at 12.7 kN dynamic (C) and 10.6 kN static (C0), 0.7 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 106 g, 61812 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 60×78×10 mm envelope of 61812 gives a D/d ratio of 1.30 and only 9.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 12.7/10.6 kN load ratings, 0.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 4400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 106 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6812LLU on the 60×78×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61812 in a rated drive.", "Order the C3 internal-clearance version (61812 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61812 is listed." ], "faq": [ { "q": "What are the dimensions of a 61812-2RS-NTN bearing?", "a": "A 61812-2RS-NTN deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61812-2RS-NTN need?", "a": "61812-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61812 with a housing grease fitting instead." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61812?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6812LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×78×10 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6812LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61812-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61812-llu", "6812llu", "61812-2RS", "61812-2rs", "6812LLU", "61812-2RS-NTN" ], "locale_variants": {} }, { "sku": "61812-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6812LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 10.6, "fatigue_load_limit_kN": 0.7, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 106, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61812-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 78 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6812LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61812 against the shaft shoulder while it cools so the ring cannot creep back.", "Only 9.0 mm of radial section separates bore and OD on the 618xx series at 60 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.", "The low-drag lip of 61812-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61812-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Never mix components between two 61812-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues this low-friction non-contact seal as 6812LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 60 mm bore 61812 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 8000 r/min the grease limiting speed for 61812 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61812 at 12.7 kN dynamic (C) and 10.6 kN static (C0), 0.7 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 106 g, 61812 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 60×78×10 mm envelope of 61812 gives a D/d ratio of 1.30 and only 9.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 12.7/10.6 kN load ratings, 0.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 8000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 106 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6812LLB on the 60×78×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61812 in a rated drive.", "Standard catalogue stock of 61812 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61812 is listed." ], "faq": [ { "q": "What are the dimensions of a 61812-RSR-NTN bearing?", "a": "A 61812-RSR-NTN deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61812-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 61812?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6812LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×78×10 mm ISO 15 envelope." }, { "q": "Is 6812LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61812-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61812-llb", "6812llb", "61812-RSR", "61812-rsr", "6812LLB", "61812-RSR-NTN" ], "locale_variants": {} }, { "sku": "61812-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6812ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 10.6, "fatigue_load_limit_kN": 0.7, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 106, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61812-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 78 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6812ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61812 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "ZZ shields are non-contact: 61812-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61812-2RS for that.", "Do not wash 61812-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6812ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 60 mm bore 61812 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 8000 r/min the grease limiting speed for 61812 covers most general-purpose industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61812 at 12.7 kN dynamic (C) and 10.6 kN static (C0), 0.7 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 106 g, 61812 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 60×78×10 mm envelope of 61812 gives a D/d ratio of 1.30 and only 9.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 12.7/10.6 kN load ratings, 0.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 8000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 106 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6812ZZ on the 60×78×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61812 in a rated drive.", "Standard catalogue stock of 61812 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61812-ZZ-NTN bearing?", "a": "A 61812-ZZ-NTN deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61812 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61812 uses the same ISO 15 envelope (60×78×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61812-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61812-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61812 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61812?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6812ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×78×10 mm ISO 15 envelope." }, { "q": "Does NTN offer 61812 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6812ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61812-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61812-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61812-zz", "6812zz", "61812-ZZ", "6812ZZ", "61812-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61912-NTN", "brand": "NTN", "manufacturer_designation": "6912", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 18.2, "static_load_kN": 14.3, "fatigue_load_limit_kN": 0.96, "limiting_speed_rpm": 7600, "max_rpm": 7600, "weight_g": 193, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61912 with C3 for those conditions.", "The 619xx thin section at 60 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61912-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 60×85×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61912 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 85 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61912-NTN.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61912 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 60 mm bore 61912 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7600 r/min the grease limiting speed for 61912 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 18.2 kN dynamic load rating (C) and 14.3 kN static (C0), 0.96 kN fatigue load limit Cu, 61912 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 193 g, 61912 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 60×85×13 mm envelope of 61912 gives a D/d ratio of 1.42 and 12.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 18.2/14.3 kN load ratings, 0.96 kN fatigue load limit Cu NTN lists the grease limiting speed at 7600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 193 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6912 on the 60×85×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61912 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61912 is listed." ], "faq": [ { "q": "What are the dimensions of a 61912-NTN bearing?", "a": "A 61912-NTN deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61912-NTN need?", "a": "The open 61912-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61912 bore code work?", "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61912?", "a": "NTN lists the open 61912 under the bare designation 6912; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 60 mm bore envelope." }, { "q": "Is 6912 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61912-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6912", "61912", "61912-NTN" ], "locale_variants": {} }, { "sku": "61912-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6912LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 18.2, "static_load_kN": 14.3, "fatigue_load_limit_kN": 0.96, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 193, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6912LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61912 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Heat is the enemy of the sealed 61912-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61912-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 85 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61912-2RS-NTN.", "Vibration during standstill brinells the raceways of a 60 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6912LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 60 mm bore 61912 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61912; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 18.2 kN dynamic load rating (C) and 14.3 kN static (C0), 0.96 kN fatigue load limit Cu, 61912 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 193 g, 61912 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 60×85×13 mm envelope of 61912 gives a D/d ratio of 1.42 and 12.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 18.2/14.3 kN load ratings, 0.96 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 193 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6912LLU on the 60×85×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61912 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61912-2RS-NTN bearing?", "a": "A 61912-2RS-NTN deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61912-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61912?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6912LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×85×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61912 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6912LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61912-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61912-llu", "6912llu", "61912-2RS", "61912-2rs", "6912LLU", "61912-2RS-NTN" ], "locale_variants": {} }, { "sku": "61912-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6912LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 18.2, "static_load_kN": 14.3, "fatigue_load_limit_kN": 0.96, "limiting_speed_rpm": 7600, "max_rpm": 7600, "weight_g": 193, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6912LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61912 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61912-RSR-NTN run faster than contact-seal 61912-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61912-2RS instead.", "The non-contact lip of 61912-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61912-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 85 mm OD should be round within IT7; an oval bore pinches the outer ring of 61912-RSR-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues this low-friction non-contact seal as 6912LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 60 mm bore 61912 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7600 r/min the grease limiting speed for 61912 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 18.2 kN dynamic load rating (C) and 14.3 kN static (C0), 0.96 kN fatigue load limit Cu, 61912 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 193 g, 61912 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 60×85×13 mm envelope of 61912 gives a D/d ratio of 1.42 and 12.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 18.2/14.3 kN load ratings, 0.96 kN fatigue load limit Cu NTN lists the grease limiting speed at 7600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 193 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6912LLB on the 60×85×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61912 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61912-RSR-NTN bearing?", "a": "A 61912-RSR-NTN deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61912 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61912 uses the same ISO 15 envelope (60×85×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61912?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6912LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×85×13 mm ISO 15 envelope." }, { "q": "Is 6912LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61912-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61912-llb", "6912llb", "61912-RSR", "61912-rsr", "6912LLB", "61912-RSR-NTN" ], "locale_variants": {} }, { "sku": "61912-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6912ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 18.2, "static_load_kN": 14.3, "fatigue_load_limit_kN": 0.96, "limiting_speed_rpm": 7600, "max_rpm": 7600, "weight_g": 193, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6912ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61912 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 60 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61912-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61912-2RS for that.", "Do not wash 61912-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Never mix components between two 61912-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6912ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 60 mm bore 61912 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7600 r/min the grease limiting speed for 61912 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 18.2 kN dynamic load rating (C) and 14.3 kN static (C0), 0.96 kN fatigue load limit Cu, 61912 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 193 g, 61912 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 60×85×13 mm envelope of 61912 gives a D/d ratio of 1.42 and 12.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 18.2/14.3 kN load ratings, 0.96 kN fatigue load limit Cu NTN lists the grease limiting speed at 7600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 193 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6912ZZ on the 60×85×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61912 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61912 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61912-ZZ-NTN bearing?", "a": "A 61912-ZZ-NTN deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61912-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61912?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6912ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×85×13 mm ISO 15 envelope." }, { "q": "Is 6912ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61912-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61912-zz", "6912zz", "61912-ZZ", "6912ZZ", "61912-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16012", "brand": "NTN", "manufacturer_designation": "16012", "series": "16000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.1, "static_load_kN": 17.5, "fatigue_load_limit_kN": 1.2, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 283, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16012 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 12 by five gives the 60 mm bore; the 95 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 16012 with C3 clearance and re-check the residual value after mounting.", "Because the 160xx narrow section shares the 95 mm OD of the 6012 at 60 mm bore but is only 11 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "Storage matters for open bearings: 16012 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16012 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16012-C3. No clearance suffix means normal CN clearance.", "Never mix components between two 16012 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 16012 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 60 mm bore 16012 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7000 r/min the grease limiting speed for 16012 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 22.1 kN dynamic load rating (C) and 17.5 kN static (C0), 1.2 kN fatigue load limit Cu, 16012 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 283 g, 16012 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 60×95×11 mm envelope of 16012 gives a D/d ratio of 1.58 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 22.1/17.5 kN load ratings, 1.2 kN fatigue load limit Cu NTN lists the grease limiting speed at 7000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 283 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16012 on the 60×95×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16012 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 16012 bearing?", "a": "A 16012 deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 11 mm width (2.362 × 3.74 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 16012 need?", "a": "The open 16012 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 16012 bore code work?", "a": "The last two digits of 16012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 11 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 16012?", "a": "NTN lists the open 16012 under the bare designation 16012; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 60 mm bore envelope." }, { "q": "What cage does NTN fit in 16012?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16012" ], "locale_variants": {} }, { "sku": "6012-NTN", "brand": "NTN", "manufacturer_designation": "6012", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.73, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 414, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6012 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 95 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6012 against the shaft shoulder while it cools so the ring cannot creep back.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6012-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 60×95×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6012-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 95 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6012-NTN.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6012-NTN drags the lip and overheats it.", "The open 6012 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 60 mm bore 6012 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7000 r/min the grease limiting speed for 6012 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 32.5 kN dynamic load rating (C) and 23.2 kN static (C0), 1.73 kN fatigue load limit Cu, 6012 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 414 g, 6012 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 60×95×18 mm envelope of 6012 gives a D/d ratio of 1.58 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 32.5/23.2 kN load ratings, 1.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 7000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 414 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6012 on the 60×95×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6012 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6012 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6012-NTN bearing?", "a": "A 6012-NTN deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6012 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6012 uses the same ISO 15 envelope (60×95×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6012-NTN have?", "a": "Unless a clearance suffix says otherwise, 6012-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6012 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6012?", "a": "NTN lists the open 6012 under the bare designation 6012; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 60 mm bore envelope." }, { "q": "Is 6012 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012", "equiv_brand": "SKF", "level": "full", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6012", "6012-NTN" ], "locale_variants": {} }, { "sku": "6012-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6012LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.73, "limiting_speed_rpm": 4100, "max_rpm": 4100, "weight_g": 414, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6012LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6012 against the shaft shoulder while it cools so the ring cannot creep back.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Heat is the enemy of the sealed 6012-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6012-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the contact-sealed version as 6012LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 60 mm bore 6012 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4100 r/min for 6012; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 32.5 kN dynamic load rating (C) and 23.2 kN static (C0), 1.73 kN fatigue load limit Cu, 6012 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 414 g, 6012 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 60×95×18 mm envelope of 6012 gives a D/d ratio of 1.58 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 32.5/23.2 kN load ratings, 1.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 4100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 414 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6012LLU on the 60×95×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6012 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6012 is listed.", "Order the C3 internal-clearance version (6012 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6012-2RS-NTN bearing?", "a": "A 6012-2RS-NTN deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6012-2RS-NTN need?", "a": "6012-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6012 with a housing grease fitting instead." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6012?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6012LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×95×18 mm ISO 15 envelope." }, { "q": "Is 6012LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6012-llu", "6012llu", "6012-2RS", "6012-2rs", "6012LLU", "6012-2RS-NTN" ], "locale_variants": {} }, { "sku": "6012-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6012LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.73, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 414, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6012-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 95 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6012LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "Choosing the 60xx extra-light section saves radial space at 60 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.", "The low-drag lip of 6012-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6012-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues this low-friction non-contact seal as 6012LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 60 mm bore 6012 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7000 r/min the grease limiting speed for 6012 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 32.5 kN dynamic load rating (C) and 23.2 kN static (C0), 1.73 kN fatigue load limit Cu, 6012 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 414 g, 6012 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 60×95×18 mm envelope of 6012 gives a D/d ratio of 1.58 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 32.5/23.2 kN load ratings, 1.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 7000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 414 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6012LLB on the 60×95×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6012 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6012 is listed." ], "faq": [ { "q": "What are the dimensions of a 6012-RSR-NTN bearing?", "a": "A 6012-RSR-NTN deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6012-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6012-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6012 and verify the residual clearance after mounting." }, { "q": "How should 6012-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6012?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6012LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×95×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6012LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6012-llb", "6012llb", "6012-RSR", "6012-rsr", "6012LLB", "6012-RSR-NTN" ], "locale_variants": {} }, { "sku": "6012-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6012ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.73, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 414, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6012-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 95 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6012ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "Choosing the 60xx extra-light section saves radial space at 60 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.", "ZZ shields are non-contact: 6012-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6012-2RS for that.", "Do not wash 6012-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 95 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6012-ZZ-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6012-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6012ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 60 mm bore 6012 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7000 r/min the grease limiting speed for 6012 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 32.5 kN dynamic load rating (C) and 23.2 kN static (C0), 1.73 kN fatigue load limit Cu, 6012 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 414 g, 6012 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 60×95×18 mm envelope of 6012 gives a D/d ratio of 1.58 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 32.5/23.2 kN load ratings, 1.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 7000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 414 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6012ZZ on the 60×95×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6012 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6012 is listed.", "Standard catalogue stock of 6012 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6012-ZZ-NTN bearing?", "a": "A 6012-ZZ-NTN deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6012-ZZ-NTN need?", "a": "6012-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6012?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6012ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×95×18 mm ISO 15 envelope." }, { "q": "Is 6012ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6012-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6012-zz", "6012zz", "6012-ZZ", "6012ZZ", "6012-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6212-NTN", "brand": "NTN", "manufacturer_designation": "6212", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58, "static_load_kN": 36, "fatigue_load_limit_kN": 2.83, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 783, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6212 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 110 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6212 with C3 for those conditions.", "At 60 mm bore the 62xx light series is the workhorse section; its 110×22 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6212-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 60×110×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6212 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6212-NTN-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6212 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 60 mm bore 6212 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6000 r/min the grease limiting speed for 6212 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6212 at 58 kN dynamic (C) and 36 kN static (C0), 2.83 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 783 g, 6212 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 60×110×22 mm envelope of 6212 gives a D/d ratio of 1.83 and 25.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 58/36 kN load ratings, 2.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 6000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 783 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6212 on the 60×110×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6212 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6212 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6212-NTN bearing?", "a": "A 6212-NTN deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6212 bore code work?", "a": "The last two digits of 6212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6212 mean?", "a": "A bare 6212 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6212?", "a": "NTN lists the open 6212 under the bare designation 6212; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 60 mm bore envelope." }, { "q": "What cage does NTN fit in 6212?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6212", "6212-NTN" ], "locale_variants": {} }, { "sku": "6212-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6212LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58, "static_load_kN": 36, "fatigue_load_limit_kN": 2.83, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 783, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6212LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6212 with C3 for those conditions.", "At 60 mm bore the 62xx light series is the workhorse section; its 110×22 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6212-2RS-NTN runs slower and cooler-limited than the open 6212; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6212-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6212-2RS-NTN.", "NTN catalogues the contact-sealed version as 6212LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 60 mm bore 6212 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 6212; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6212 at 58 kN dynamic (C) and 36 kN static (C0), 2.83 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 783 g, 6212 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 60×110×22 mm envelope of 6212 gives a D/d ratio of 1.83 and 25.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 58/36 kN load ratings, 2.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 783 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6212LLU on the 60×110×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6212 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6212 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6212-2RS-NTN bearing?", "a": "A 6212-2RS-NTN deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6212-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6212?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6212LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×110×22 mm ISO 15 envelope." }, { "q": "Is 6212LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6212-llu", "6212llu", "6212-2RS", "6212-2rs", "6212LLU", "6212-2RS-NTN" ], "locale_variants": {} }, { "sku": "6212-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6212LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58, "static_load_kN": 36, "fatigue_load_limit_kN": 2.83, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 783, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6212-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 110 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6212LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6212 with C3 clearance and re-check the residual value after mounting.", "At 60 mm bore the 62xx light series is the workhorse section; its 110×22 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6212-RSR-NTN run faster than contact-seal 6212-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6212-2RS instead.", "The non-contact lip of 6212-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 110 mm OD should be round within IT7; an oval bore pinches the outer ring of 6212-RSR-NTN and shows up later as two-point loaded raceway wear.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues this low-friction non-contact seal as 6212LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 60 mm bore 6212 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 6212; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6212 at 58 kN dynamic (C) and 36 kN static (C0), 2.83 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 783 g, 6212 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 60×110×22 mm envelope of 6212 gives a D/d ratio of 1.83 and 25.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 58/36 kN load ratings, 2.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 783 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6212LLB on the 60×110×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6212 in a rated drive.", "Standard catalogue stock of 6212 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6212-RSR-NTN bearing?", "a": "A 6212-RSR-NTN deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "Are 6212 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6212 uses the same ISO 15 envelope (60×110×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6212?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6212LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×110×22 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6212LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6212-llb", "6212llb", "6212-RSR", "6212-rsr", "6212LLB", "6212-RSR-NTN" ], "locale_variants": {} }, { "sku": "6212-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6212ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58, "static_load_kN": 36, "fatigue_load_limit_kN": 2.83, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 783, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6212ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6212 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6212-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6212-2RS for that.", "Shielded 6212-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Never mix components between two 6212-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6212ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 60 mm bore 6212 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 6212; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6212 at 58 kN dynamic (C) and 36 kN static (C0), 2.83 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 783 g, 6212 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 60×110×22 mm envelope of 6212 gives a D/d ratio of 1.83 and 25.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 58/36 kN load ratings, 2.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 783 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6212ZZ on the 60×110×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6212 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6212 is listed." ], "faq": [ { "q": "What are the dimensions of a 6212-ZZ-NTN bearing?", "a": "A 6212-ZZ-NTN deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6212-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6212-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6212 and verify the residual clearance after mounting." }, { "q": "How should 6212-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6212?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6212ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×110×22 mm ISO 15 envelope." }, { "q": "Does NTN offer 6212 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6212ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6212-zz", "6212zz", "6212-ZZ", "6212ZZ", "6212-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6312-NTN", "brand": "NTN", "manufacturer_designation": "6312", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 90.5, "static_load_kN": 52, "fatigue_load_limit_kN": 4.1, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 1730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6312 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 130 mm outside diameter and 31 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6312 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.", "The open 6312-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 60×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6312-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 6312-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6312-NTN.", "The open 6312 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 60 mm bore 6312 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 6312 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 90.5 kN dynamic load rating (C) and 52 kN static (C0), 4.1 kN fatigue load limit Cu, 6312 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1730 g (1.7 kg), 6312 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 60×130×31 mm envelope of 6312 gives a D/d ratio of 2.17 and 35.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 90.5/52 kN load ratings, 4.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1730 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6312 on the 60×130×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6312 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6312 is listed." ], "faq": [ { "q": "What are the dimensions of a 6312-NTN bearing?", "a": "A 6312-NTN deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6312 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6312 uses the same ISO 15 envelope (60×130×31 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6312-NTN have?", "a": "Unless a clearance suffix says otherwise, 6312-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6312 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6312?", "a": "NTN lists the open 6312 under the bare designation 6312; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 60 mm bore envelope." }, { "q": "Does NTN offer 6312 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6312 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "full", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "full", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "312", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6312", "6312-NTN" ], "locale_variants": {} }, { "sku": "6312-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6312LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 90.5, "static_load_kN": 52, "fatigue_load_limit_kN": 4.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 1730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6312-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 130 mm outside diameter and 31 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6312LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6312 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.", "Contact seals add drag and heat: 6312-2RS-NTN runs slower and cooler-limited than the open 6312; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6312-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 31 mm-wide ring of 6312-2RS-NTN drags the lip and overheats it.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6312-2RS-NTN.", "NTN catalogues the contact-sealed version as 6312LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 60 mm bore 6312 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6312; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 90.5 kN dynamic load rating (C) and 52 kN static (C0), 4.1 kN fatigue load limit Cu, 6312 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1730 g (1.7 kg), 6312 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 60×130×31 mm envelope of 6312 gives a D/d ratio of 2.17 and 35.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 90.5/52 kN load ratings, 4.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1730 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6312LLU on the 60×130×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6312 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6312 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6312-2RS-NTN bearing?", "a": "A 6312-2RS-NTN deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6312-2RS-NTN need?", "a": "6312-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6312 with a housing grease fitting instead." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6312?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6312LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×130×31 mm ISO 15 envelope." }, { "q": "Does NTN offer 6312 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6312LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "full", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "312", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6312-llu", "6312llu", "6312-2RS", "6312-2rs", "6312LLU", "6312-2RS-NTN" ], "locale_variants": {} }, { "sku": "6312-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6312LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 90.5, "static_load_kN": 52, "fatigue_load_limit_kN": 4.1, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 1730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6312LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium section at 60 mm bore gains dynamic rating through larger rolling elements on a 130 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.", "The low-drag lip of 6312-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6312-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Vibration during standstill brinells the raceways of a 60 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues this low-friction non-contact seal as 6312LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 60 mm bore 6312 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 6312 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 90.5 kN dynamic load rating (C) and 52 kN static (C0), 4.1 kN fatigue load limit Cu, 6312 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1730 g (1.7 kg), 6312 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 60×130×31 mm envelope of 6312 gives a D/d ratio of 2.17 and 35.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 90.5/52 kN load ratings, 4.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1730 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6312LLB on the 60×130×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6312 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6312 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6312-RSR-NTN bearing?", "a": "A 6312-RSR-NTN deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6312-RSR-NTN need?", "a": "6312-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6312 with a housing grease fitting instead." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6312?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6312LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×130×31 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6312LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "full", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "312", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6312-llb", "6312llb", "6312-RSR", "6312-rsr", "6312LLB", "6312-RSR-NTN" ], "locale_variants": {} }, { "sku": "6312-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6312ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 90.5, "static_load_kN": 52, "fatigue_load_limit_kN": 4.1, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 1730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6312ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium section at 60 mm bore gains dynamic rating through larger rolling elements on a 130 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6312-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6312-2RS for that.", "Shielded 6312-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 31 mm-wide ring of 6312-ZZ-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6312-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6312ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 60 mm bore 6312 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 6312 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 90.5 kN dynamic load rating (C) and 52 kN static (C0), 4.1 kN fatigue load limit Cu, 6312 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1730 g (1.7 kg), 6312 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 60×130×31 mm envelope of 6312 gives a D/d ratio of 2.17 and 35.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 90.5/52 kN load ratings, 4.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1730 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6312ZZ on the 60×130×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6312 in a rated drive.", "Order the C3 internal-clearance version (6312 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6312-ZZ-NTN bearing?", "a": "A 6312-ZZ-NTN deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6312-ZZ-NTN need?", "a": "6312-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6312?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6312ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×130×31 mm ISO 15 envelope." }, { "q": "Does NTN offer 6312 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6312ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "full", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "312", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6312-zz", "6312zz", "6312-ZZ", "6312ZZ", "6312-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6412-NTN", "brand": "NTN", "manufacturer_designation": "6412", "series": "6400-series", "type": "deep_groove", "d_mm": 60, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 113, "static_load_kN": 64.5, "fatigue_load_limit_kN": 4.9, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 2770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6412 against the shaft shoulder while it cools so the ring cannot creep back.", "The 64xx heavy section at 60 mm bore (150 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6412-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 60×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6412 units.", "Never mix components between two 6412-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6400-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6412 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 60 mm bore 6412 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 6412; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 113 kN dynamic load rating (C) and 64.5 kN static (C0), 4.9 kN fatigue load limit Cu, 6412 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2770 g (2.8 kg), 6412 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 60×150×35 mm envelope of 6412 gives a D/d ratio of 2.50 and 45.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 113/64.5 kN load ratings, 4.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2770 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6412 on the 60×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6412 in a rated drive.", "Standard catalogue stock of 6412 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6412 is listed." ], "faq": [ { "q": "What are the dimensions of a 6412-NTN bearing?", "a": "A 6412-NTN deep-groove ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6412-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6412-NTN need?", "a": "The open 6412-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6412?", "a": "NTN lists the open 6412 under the bare designation 6412; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 60 mm bore envelope." }, { "q": "Is 6412 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6412-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6412", "equiv_brand": "SKF", "level": "full", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6412", "6412-NTN" ], "locale_variants": {} }, { "sku": "6412-ZZ", "brand": "NTN", "manufacturer_designation": "6412ZZ", "series": "6400-series", "type": "deep_groove", "d_mm": 60, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 113, "static_load_kN": 64.5, "fatigue_load_limit_kN": 4.9, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 2770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6412-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 150 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6412ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6412 with C3 for those conditions.", "The 64xx heavy section at 60 mm bore exists for high radial load at moderate rpm; its 150 mm OD and 35 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "ZZ shields are non-contact: 6412-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6412-2RS for that.", "Shielded 6412-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6400-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6412ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 60 mm bore 6412 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 6412; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 113 kN dynamic load rating (C) and 64.5 kN static (C0), 4.9 kN fatigue load limit Cu, 6412 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2770 g (2.8 kg), 6412 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 60×150×35 mm envelope of 6412 gives a D/d ratio of 2.50 and 45.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 113/64.5 kN load ratings, 4.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2770 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6412ZZ on the 60×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6412 in a rated drive.", "Standard catalogue stock of 6412 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6412-ZZ bearing?", "a": "A 6412-ZZ deep-groove ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6412-ZZ need?", "a": "6412-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6412 bore code work?", "a": "The last two digits of 6412 are bore code 12, giving 12 × 5 = 60 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6412?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6412ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 60×150×35 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6412ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6412-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6412", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6412-zz", "6412zz", "6412-ZZ", "6412ZZ" ], "locale_variants": {} }, { "sku": "61813-NTN", "brand": "NTN", "manufacturer_designation": "6813", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.73, "limiting_speed_rpm": 7400, "max_rpm": 7400, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61813 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 85 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61813 against the shaft shoulder while it cools so the ring cannot creep back.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 65 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6213.", "The open 61813-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 65×85×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61813 units.", "The housing bore for the 85 mm OD should be round within IT7; an oval bore pinches the outer ring of 61813-NTN and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61813-NTN-C3. No clearance suffix means normal CN clearance.", "The open 61813 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 65 mm bore 61813 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7400 r/min the grease limiting speed for 61813 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61813 at 12.8 kN dynamic (C) and 11 kN static (C0), 0.73 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 128 g, 61813 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 65×85×10 mm envelope of 61813 gives a D/d ratio of 1.31 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 12.8/11 kN load ratings, 0.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 7400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 128 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6813 on the 65×85×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61813 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61813 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61813-NTN bearing?", "a": "A 61813-NTN deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61813-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61813-NTN need?", "a": "The open 61813-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61813?", "a": "NTN lists the open 61813 under the bare designation 6813; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 65 mm bore envelope." }, { "q": "Does NTN offer 61813 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6813 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61813-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6813", "61813", "61813-NTN" ], "locale_variants": {} }, { "sku": "61813-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6813LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.73, "limiting_speed_rpm": 4100, "max_rpm": 4100, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61813-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 85 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6813LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 65 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6213.", "Contact seals add drag and heat: 61813-2RS-NTN runs slower and cooler-limited than the open 61813; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61813-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 61813-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61813-2RS-NTN.", "NTN catalogues the contact-sealed version as 6813LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 65 mm bore 61813 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4100 r/min for 61813; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61813 at 12.8 kN dynamic (C) and 11 kN static (C0), 0.73 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 128 g, 61813 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 65×85×10 mm envelope of 61813 gives a D/d ratio of 1.31 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 12.8/11 kN load ratings, 0.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 4100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 128 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6813LLU on the 65×85×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61813 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61813-2RS-NTN bearing?", "a": "A 61813-2RS-NTN deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61813-2RS-NTN need?", "a": "61813-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61813 with a housing grease fitting instead." }, { "q": "How does the 61813 bore code work?", "a": "The last two digits of 61813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61813?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6813LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×85×10 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6813LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61813-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61813-llu", "6813llu", "61813-2RS", "61813-2rs", "6813LLU", "61813-2RS-NTN" ], "locale_variants": {} }, { "sku": "61813-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6813LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.73, "limiting_speed_rpm": 7400, "max_rpm": 7400, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61813-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 85 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6813LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61813 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "RSR low-friction seals on 61813-RSR-NTN run faster than contact-seal 61813-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61813-2RS instead.", "The low-drag lip of 61813-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The housing bore for the 85 mm OD should be round within IT7; an oval bore pinches the outer ring of 61813-RSR-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues this low-friction non-contact seal as 6813LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 65 mm bore 61813 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7400 r/min the grease limiting speed for 61813 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61813 at 12.8 kN dynamic (C) and 11 kN static (C0), 0.73 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 128 g, 61813 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 65×85×10 mm envelope of 61813 gives a D/d ratio of 1.31 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 12.8/11 kN load ratings, 0.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 7400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 128 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6813LLB on the 65×85×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61813 in a rated drive.", "Order the C3 internal-clearance version (61813 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61813-RSR-NTN bearing?", "a": "A 61813-RSR-NTN deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 65 mm bore?", "a": "618 is an extra-thin section: 85×10 mm, only 10.0 mm radial section at 65 mm bore, far smaller than a 6213, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61813 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61813 uses the same ISO 15 envelope (65×85×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61813?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6813LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×85×10 mm ISO 15 envelope." }, { "q": "Is 6813LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61813-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61813-llb", "6813llb", "61813-RSR", "61813-rsr", "6813LLB", "61813-RSR-NTN" ], "locale_variants": {} }, { "sku": "61813-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6813ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.73, "limiting_speed_rpm": 7400, "max_rpm": 7400, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61813-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 85 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6813ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 65 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6213.", "ZZ shields are non-contact: 61813-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61813-2RS for that.", "Do not wash 61813-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 61813-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6813ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 65 mm bore 61813 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7400 r/min the grease limiting speed for 61813 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61813 at 12.8 kN dynamic (C) and 11 kN static (C0), 0.73 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 128 g, 61813 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 65×85×10 mm envelope of 61813 gives a D/d ratio of 1.31 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 12.8/11 kN load ratings, 0.73 kN fatigue load limit Cu NTN lists the grease limiting speed at 7400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 128 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6813ZZ on the 65×85×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61813 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61813-ZZ-NTN bearing?", "a": "A 61813-ZZ-NTN deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61800 compare with other series at the same 65 mm bore?", "a": "618 is an extra-thin section: 85×10 mm, only 10.0 mm radial section at 65 mm bore, far smaller than a 6213, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61813 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61813 uses the same ISO 15 envelope (65×85×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61813?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6813ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×85×10 mm ISO 15 envelope." }, { "q": "Does NTN offer 61813 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6813ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61813-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61813-zz", "6813zz", "61813-ZZ", "6813ZZ", "61813-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61913-NTN", "brand": "NTN", "manufacturer_designation": "6913", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.3, "static_load_kN": 16.1, "fatigue_load_limit_kN": 1.07, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 206, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61913 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 90 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61913 with C3 for those conditions.", "The 619xx thin section at 65 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61913-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 65×90×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61913 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 61913-NTN and shows up later as two-point loaded raceway wear.", "The open 61913 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 65 mm bore 61913 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7000 r/min the grease limiting speed for 61913 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 19.3 kN dynamic load rating (C) and 16.1 kN static (C0), 1.07 kN fatigue load limit Cu, 61913 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 206 g, 61913 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×90×13 mm envelope of 61913 gives a D/d ratio of 1.38 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 19.3/16.1 kN load ratings, 1.07 kN fatigue load limit Cu NTN lists the grease limiting speed at 7000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 206 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6913 on the 65×90×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61913 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 61913 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61913-NTN bearing?", "a": "A 61913-NTN deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61913-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61913-NTN need?", "a": "The open 61913-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61913?", "a": "NTN lists the open 61913 under the bare designation 6913; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 65 mm bore envelope." }, { "q": "What cage does NTN fit in 6913?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61913-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913", "equiv_brand": "SKF", "level": "full", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6913", "61913", "61913-NTN" ], "locale_variants": {} }, { "sku": "61913-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6913LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.3, "static_load_kN": 16.1, "fatigue_load_limit_kN": 1.07, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 206, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6913LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61913 with C3 for those conditions.", "The 619xx thin section at 65 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61913-2RS-NTN runs slower and cooler-limited than the open 61913; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61913-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the contact-sealed version as 6913LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 65 mm bore 61913 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 61913; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 19.3 kN dynamic load rating (C) and 16.1 kN static (C0), 1.07 kN fatigue load limit Cu, 61913 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 206 g, 61913 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×90×13 mm envelope of 61913 gives a D/d ratio of 1.38 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 19.3/16.1 kN load ratings, 1.07 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 206 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6913LLU on the 65×90×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61913 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61913 is listed." ], "faq": [ { "q": "What are the dimensions of a 61913-2RS-NTN bearing?", "a": "A 61913-2RS-NTN deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61913-2RS-NTN need?", "a": "61913-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61913 with a housing grease fitting instead." }, { "q": "How does the 61913 bore code work?", "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61913?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6913LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×90×13 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6913LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61913-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61913-llu", "6913llu", "61913-2RS", "61913-2rs", "6913LLU", "61913-2RS-NTN" ], "locale_variants": {} }, { "sku": "61913-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6913LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.3, "static_load_kN": 16.1, "fatigue_load_limit_kN": 1.07, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 206, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6913LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61913 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The low-drag lip of 61913-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61913-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues this low-friction non-contact seal as 6913LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 65 mm bore 61913 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7000 r/min the grease limiting speed for 61913 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 19.3 kN dynamic load rating (C) and 16.1 kN static (C0), 1.07 kN fatigue load limit Cu, 61913 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 206 g, 61913 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×90×13 mm envelope of 61913 gives a D/d ratio of 1.38 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 19.3/16.1 kN load ratings, 1.07 kN fatigue load limit Cu NTN lists the grease limiting speed at 7000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 206 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6913LLB on the 65×90×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61913 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61913-RSR-NTN bearing?", "a": "A 61913-RSR-NTN deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61913 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61913 uses the same ISO 15 envelope (65×90×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61913-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 61913-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61913 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61913?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6913LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×90×13 mm ISO 15 envelope." }, { "q": "Is 6913LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61913-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61913-llb", "6913llb", "61913-RSR", "61913-rsr", "6913LLB", "61913-RSR-NTN" ], "locale_variants": {} }, { "sku": "61913-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6913ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.3, "static_load_kN": 16.1, "fatigue_load_limit_kN": 1.07, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 206, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61913-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 90 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6913ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61913 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Do not wash 61913-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61913-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6913ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 65 mm bore 61913 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 7000 r/min the grease limiting speed for 61913 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 19.3 kN dynamic load rating (C) and 16.1 kN static (C0), 1.07 kN fatigue load limit Cu, 61913 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 206 g, 61913 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×90×13 mm envelope of 61913 gives a D/d ratio of 1.38 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 19.3/16.1 kN load ratings, 1.07 kN fatigue load limit Cu NTN lists the grease limiting speed at 7000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 206 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6913ZZ on the 65×90×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61913 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61913 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61913-ZZ-NTN bearing?", "a": "A 61913-ZZ-NTN deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61913-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61913?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6913ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×90×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61913 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6913ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61913-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61913-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61913-zz", "6913zz", "61913-ZZ", "6913ZZ", "61913-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16013", "brand": "NTN", "manufacturer_designation": "16013", "series": "16000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.7, "static_load_kN": 18.7, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 307, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 16013 against the shaft shoulder while it cools so the ring cannot creep back.", "Because the 160xx narrow section shares the 100 mm OD of the 6013 at 65 mm bore but is only 11 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16013 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×100×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16013 units.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 16013.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 11 mm-wide ring of 16013 drags the lip and overheats it.", "The open 16013 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 65 mm bore 16013 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6500 r/min the grease limiting speed for 16013 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 22.7 kN dynamic load rating (C) and 18.7 kN static (C0), 1.26 kN fatigue load limit Cu, 16013 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 307 g, 16013 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×100×11 mm envelope of 16013 gives a D/d ratio of 1.54 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 22.7/18.7 kN load ratings, 1.26 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 307 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16013 on the 65×100×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16013 in a rated drive.", "Standard catalogue stock of 16013 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 16013 bearing?", "a": "A 16013 deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 11 mm width (2.559 × 3.937 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 65 mm bore?", "a": "160 is the narrow extra-light section: 100×11 mm with a 17.5 mm radial section at 65 mm bore. It has the same bore and outside diameter as the 6013 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16013 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16013 uses the same ISO 15 envelope (65×100×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16013?", "a": "NTN lists the open 16013 under the bare designation 16013; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 65 mm bore envelope." }, { "q": "Does NTN offer 16013 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16013 is the correct choice." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16013" ], "locale_variants": {} }, { "sku": "6013-NTN", "brand": "NTN", "manufacturer_designation": "6013", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34, "static_load_kN": 25.2, "fatigue_load_limit_kN": 1.83, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 421, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6013 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 100 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6013 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6013-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6013 units.", "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6013-NTN.", "The open 6013 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 65 mm bore 6013 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6500 r/min the grease limiting speed for 6013 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 34 kN dynamic load rating (C) and 25.2 kN static (C0), 1.83 kN fatigue load limit Cu, 6013 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 421 g, 6013 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×100×18 mm envelope of 6013 gives a D/d ratio of 1.54 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 34/25.2 kN load ratings, 1.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 421 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6013 on the 65×100×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6013 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6013 is listed." ], "faq": [ { "q": "What are the dimensions of a 6013-NTN bearing?", "a": "A 6013-NTN deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6013 mean?", "a": "A bare 6013 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 65 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (100×18 mm, 17.5 mm radial section) at 65 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN order number for an open 6013?", "a": "NTN lists the open 6013 under the bare designation 6013; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 65 mm bore envelope." }, { "q": "Is 6013 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6013-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013", "equiv_brand": "SKF", "level": "full", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6013", "6013-NTN" ], "locale_variants": {} }, { "sku": "6013-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6013LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34, "static_load_kN": 25.2, "fatigue_load_limit_kN": 1.83, "limiting_speed_rpm": 3900, "max_rpm": 3900, "weight_g": 421, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6013-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 100 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6013LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6013 with C3 for those conditions.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6013-2RS-NTN runs slower and cooler-limited than the open 6013; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6013-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6013-2RS-NTN.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6013-2RS-NTN.", "NTN catalogues the contact-sealed version as 6013LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 65 mm bore 6013 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3900 r/min for 6013; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 34 kN dynamic load rating (C) and 25.2 kN static (C0), 1.83 kN fatigue load limit Cu, 6013 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 421 g, 6013 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×100×18 mm envelope of 6013 gives a D/d ratio of 1.54 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 34/25.2 kN load ratings, 1.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 3900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 421 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6013LLU on the 65×100×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6013 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6013 is listed." ], "faq": [ { "q": "What are the dimensions of a 6013-2RS-NTN bearing?", "a": "A 6013-2RS-NTN deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6013-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 65 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (100×18 mm, 17.5 mm radial section) at 65 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN suffix for a sealed 6013?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6013LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×100×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 6013 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6013LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6013-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6013-llu", "6013llu", "6013-2RS", "6013-2rs", "6013LLU", "6013-2RS-NTN" ], "locale_variants": {} }, { "sku": "6013-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6013LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34, "static_load_kN": 25.2, "fatigue_load_limit_kN": 1.83, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 421, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6013-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 100 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6013LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6013 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The low-drag lip of 6013-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6013-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6013-RSR-NTN.", "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues this low-friction non-contact seal as 6013LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 65 mm bore 6013 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6500 r/min the grease limiting speed for 6013 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 34 kN dynamic load rating (C) and 25.2 kN static (C0), 1.83 kN fatigue load limit Cu, 6013 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 421 g, 6013 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×100×18 mm envelope of 6013 gives a D/d ratio of 1.54 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 34/25.2 kN load ratings, 1.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 421 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6013LLB on the 65×100×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6013 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6013-RSR-NTN bearing?", "a": "A 6013-RSR-NTN deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6013-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6013-RSR-NTN need?", "a": "6013-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6013 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6013?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6013LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×100×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 6013 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6013LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6013-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6013-llb", "6013llb", "6013-RSR", "6013-rsr", "6013LLB", "6013-RSR-NTN" ], "locale_variants": {} }, { "sku": "6013-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6013ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34, "static_load_kN": 25.2, "fatigue_load_limit_kN": 1.83, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 421, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6013ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6013 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6013-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6013-2RS for that.", "Do not wash 6013-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6013-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "Never mix components between two 6013-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6013ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 65 mm bore 6013 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6500 r/min the grease limiting speed for 6013 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 34 kN dynamic load rating (C) and 25.2 kN static (C0), 1.83 kN fatigue load limit Cu, 6013 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 421 g, 6013 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×100×18 mm envelope of 6013 gives a D/d ratio of 1.54 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 34/25.2 kN load ratings, 1.83 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 421 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6013ZZ on the 65×100×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6013 in a rated drive.", "Order the C3 internal-clearance version (6013 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6013 is listed." ], "faq": [ { "q": "What are the dimensions of a 6013-ZZ-NTN bearing?", "a": "A 6013-ZZ-NTN deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6013 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6013 uses the same ISO 15 envelope (65×100×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6013-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6013-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6013 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6013?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6013ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×100×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6013ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6013-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6013-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6013-zz", "6013zz", "6013-ZZ", "6013ZZ", "6013-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6213-NTN", "brand": "NTN", "manufacturer_designation": "6213", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63.5, "static_load_kN": 40, "fatigue_load_limit_kN": 3.15, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 990, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6213 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 120 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6213 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "The open 6213-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 65×120×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6213 units.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6213-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6213 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 65 mm bore 6213 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5500 r/min the grease limiting speed for 6213 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6213 at 63.5 kN dynamic (C) and 40 kN static (C0), 3.15 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 990 g, 6213 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×120×23 mm envelope of 6213 gives a D/d ratio of 1.85 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 63.5/40 kN load ratings, 3.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 5500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 990 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6213 on the 65×120×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6213 in a rated drive.", "Order the C3 internal-clearance version (6213 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6213 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6213-NTN bearing?", "a": "A 6213-NTN deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "Are 6213 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6213 uses the same ISO 15 envelope (65×120×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6213?", "a": "NTN lists the open 6213 under the bare designation 6213; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 65 mm bore envelope." }, { "q": "Is 6213 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6213", "6213-NTN" ], "locale_variants": {} }, { "sku": "6213-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6213LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63.5, "static_load_kN": 40, "fatigue_load_limit_kN": 3.15, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 990, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6213-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 120 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6213LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6213 with C3 clearance and re-check the residual value after mounting.", "At 65 mm bore the 62xx light series is the workhorse section; its 120×23 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6213-2RS-NTN runs slower and cooler-limited than the open 6213; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6213-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6213-2RS-NTN drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6213LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 65 mm bore 6213 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6213; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6213 at 63.5 kN dynamic (C) and 40 kN static (C0), 3.15 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 990 g, 6213 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×120×23 mm envelope of 6213 gives a D/d ratio of 1.85 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 63.5/40 kN load ratings, 3.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 990 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6213LLU on the 65×120×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6213 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6213 is listed.", "Order the C3 internal-clearance version (6213 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6213-2RS-NTN bearing?", "a": "A 6213-2RS-NTN deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6213-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6213-2RS-NTN need?", "a": "6213-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6213 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6213?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6213LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×120×23 mm ISO 15 envelope." }, { "q": "Does NTN offer 6213 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6213LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6213-llu", "6213llu", "6213-2RS", "6213-2rs", "6213LLU", "6213-2RS-NTN" ], "locale_variants": {} }, { "sku": "6213-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6213LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63.5, "static_load_kN": 40, "fatigue_load_limit_kN": 3.15, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 990, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6213-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 120 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6213LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6213 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6213-RSR-NTN run faster than contact-seal 6213-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6213-2RS instead.", "The low-drag lip of 6213-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues this low-friction non-contact seal as 6213LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 65 mm bore 6213 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5500 r/min the grease limiting speed for 6213 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6213 at 63.5 kN dynamic (C) and 40 kN static (C0), 3.15 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 990 g, 6213 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×120×23 mm envelope of 6213 gives a D/d ratio of 1.85 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 63.5/40 kN load ratings, 3.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 5500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 990 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6213LLB on the 65×120×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6213 in a rated drive.", "Standard catalogue stock of 6213 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6213-RSR-NTN bearing?", "a": "A 6213-RSR-NTN deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6213-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6213?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6213LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×120×23 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6213LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6213-llb", "6213llb", "6213-RSR", "6213-rsr", "6213LLB", "6213-RSR-NTN" ], "locale_variants": {} }, { "sku": "6213-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6213ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63.5, "static_load_kN": 40, "fatigue_load_limit_kN": 3.15, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 990, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6213ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.", "At 65 mm bore the 62xx light series is the workhorse section; its 120×23 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6213-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6213-2RS for that.", "Do not wash 6213-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "The housing bore for the 120 mm OD should be round within IT7; an oval bore pinches the outer ring of 6213-ZZ-NTN and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6213ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 65 mm bore 6213 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5500 r/min the grease limiting speed for 6213 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6213 at 63.5 kN dynamic (C) and 40 kN static (C0), 3.15 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 990 g, 6213 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 65×120×23 mm envelope of 6213 gives a D/d ratio of 1.85 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 63.5/40 kN load ratings, 3.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 5500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 990 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6213ZZ on the 65×120×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6213 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6213-ZZ-NTN bearing?", "a": "A 6213-ZZ-NTN deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6213-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6213?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6213ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×120×23 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6213ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6213-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6213-zz", "6213zz", "6213-ZZ", "6213ZZ", "6213-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6313-NTN", "brand": "NTN", "manufacturer_designation": "6313", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 103, "static_load_kN": 60, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 4900, "max_rpm": 4900, "weight_g": 2080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6313 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6313 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "The open 6313-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 65×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6313 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6313-NTN.", "The open 6313 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 65 mm bore 6313 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4900 r/min for 6313; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 103 kN dynamic load rating (C) and 60 kN static (C0), 4.6 kN fatigue load limit Cu, 6313 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2080 g (2.1 kg), 6313 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 65×140×33 mm envelope of 6313 gives a D/d ratio of 2.15 and 37.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 103/60 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2080 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6313 on the 65×140×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6313 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6313-NTN bearing?", "a": "A 6313-NTN deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6313-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6313-NTN need?", "a": "The open 6313-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6313?", "a": "NTN lists the open 6313 under the bare designation 6313; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 65 mm bore envelope." }, { "q": "Does NTN offer 6313 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6313 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "full", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "313", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6313", "6313-NTN" ], "locale_variants": {} }, { "sku": "6313-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6313LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 103, "static_load_kN": 60, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 3300, "max_rpm": 3300, "weight_g": 2080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6313LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6313 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium section at 65 mm bore gains dynamic rating through larger rolling elements on a 140 mm OD; the penalty is mass and a lower limiting speed than the 6213 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6313-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6313-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6313-2RS-NTN.", "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6313LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 65 mm bore 6313 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3300 r/min for 6313; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 103 kN dynamic load rating (C) and 60 kN static (C0), 4.6 kN fatigue load limit Cu, 6313 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2080 g (2.1 kg), 6313 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 65×140×33 mm envelope of 6313 gives a D/d ratio of 2.15 and 37.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 103/60 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 3300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2080 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6313LLU on the 65×140×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6313 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6313 is listed." ], "faq": [ { "q": "What are the dimensions of a 6313-2RS-NTN bearing?", "a": "A 6313-2RS-NTN deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6313 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6313 uses the same ISO 15 envelope (65×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6313-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6313-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6313 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6313?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6313LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×140×33 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6313LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "313", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6313-llu", "6313llu", "6313-2RS", "6313-2rs", "6313LLU", "6313-2RS-NTN" ], "locale_variants": {} }, { "sku": "6313-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6313LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 103, "static_load_kN": 60, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 4900, "max_rpm": 4900, "weight_g": 2080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6313LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "The low-drag lip of 6313-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6313-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6313-RSR-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6313LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 65 mm bore 6313 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4900 r/min for 6313; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 103 kN dynamic load rating (C) and 60 kN static (C0), 4.6 kN fatigue load limit Cu, 6313 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2080 g (2.1 kg), 6313 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 65×140×33 mm envelope of 6313 gives a D/d ratio of 2.15 and 37.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 103/60 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2080 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6313LLB on the 65×140×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6313 in a rated drive.", "Order the C3 internal-clearance version (6313 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6313 is listed." ], "faq": [ { "q": "What are the dimensions of a 6313-RSR-NTN bearing?", "a": "A 6313-RSR-NTN deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6313 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6313 uses the same ISO 15 envelope (65×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6313?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6313LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×140×33 mm ISO 15 envelope." }, { "q": "Is 6313LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "313", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6313-llb", "6313llb", "6313-RSR", "6313-rsr", "6313LLB", "6313-RSR-NTN" ], "locale_variants": {} }, { "sku": "6313-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6313ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 103, "static_load_kN": 60, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 4900, "max_rpm": 4900, "weight_g": 2080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6313-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6313ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "ZZ shields are non-contact: 6313-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6313-2RS for that.", "Do not wash 6313-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6313-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 33 mm-wide ring of 6313-ZZ-NTN drags the lip and overheats it.", "NTN catalogues the shielded version as 6313ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 65 mm bore 6313 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4900 r/min for 6313; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 103 kN dynamic load rating (C) and 60 kN static (C0), 4.6 kN fatigue load limit Cu, 6313 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2080 g (2.1 kg), 6313 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 65×140×33 mm envelope of 6313 gives a D/d ratio of 2.15 and 37.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 103/60 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2080 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6313ZZ on the 65×140×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6313 in a rated drive.", "Order the C3 internal-clearance version (6313 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6313-ZZ-NTN bearing?", "a": "A 6313-ZZ-NTN deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6313-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN suffix for a sealed 6313?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6313ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 65×140×33 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6313ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "full", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "313", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6313-zz", "6313zz", "6313-ZZ", "6313ZZ", "6313-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6413-NTN", "brand": "NTN", "manufacturer_designation": "6413", "series": "6400-series", "type": "deep_groove", "d_mm": 65, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 123, "static_load_kN": 72.5, "fatigue_load_limit_kN": 5.35, "limiting_speed_rpm": 4400, "max_rpm": 4400, "weight_g": 3300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6413 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 160 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6413 with C3 clearance and re-check the residual value after mounting.", "The 64xx heavy section at 65 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6413-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 65×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6413 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 37 mm-wide ring of 6413-NTN drags the lip and overheats it.", "The open 6413 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 65 mm bore 6413 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4400 r/min for 6413; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 123 kN dynamic load rating (C) and 72.5 kN static (C0), 5.35 kN fatigue load limit Cu, 6413 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3300 g (3.3 kg), 6413 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 65×160×37 mm envelope of 6413 gives a D/d ratio of 2.46 and 47.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 123/72.5 kN load ratings, 5.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 4400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6413 on the 65×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6413 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 6413 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6413-NTN bearing?", "a": "A 6413-NTN deep-groove ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6413 mean?", "a": "A bare 6413 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 65 mm bore?", "a": "The '4' is the heavy diameter series: 160×37 mm, 47.5 mm radial section at 65 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN order number for an open 6413?", "a": "NTN lists the open 6413 under the bare designation 6413; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 65 mm bore envelope." }, { "q": "Does NTN offer 6413 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6413 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6413-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6413-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6413", "equiv_brand": "SKF", "level": "full", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6413", "6413-NTN" ], "locale_variants": {} }, { "sku": "61814-NTN", "brand": "NTN", "manufacturer_designation": "6814", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.4, "static_load_kN": 11.9, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 6900, "max_rpm": 6900, "weight_g": 137, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61814 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "Storage matters for open bearings: 61814-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61814 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61814 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 61814 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6900 r/min the grease limiting speed for 61814 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61814 at 13.4 kN dynamic (C) and 11.9 kN static (C0), 0.8 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 137 g, 61814 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 70×90×10 mm envelope of 61814 gives a D/d ratio of 1.29 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.4/11.9 kN load ratings, 0.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 6900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 137 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6814 on the 70×90×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61814 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61814-NTN bearing?", "a": "A 61814-NTN deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61814-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61814-NTN need?", "a": "The open 61814-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61814?", "a": "NTN lists the open 61814 under the bare designation 6814; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "Does NTN offer 61814 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6814 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6814", "61814", "61814-NTN" ], "locale_variants": {} }, { "sku": "61814-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6814LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.4, "static_load_kN": 11.9, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 137, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6814LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61814 with C3 for those conditions.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 70 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6214.", "Contact seals add drag and heat: 61814-2RS-NTN runs slower and cooler-limited than the open 61814; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61814-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61814-2RS-NTN.", "Never mix components between two 61814-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the contact-sealed version as 6814LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 70 mm bore 61814 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 61814; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61814 at 13.4 kN dynamic (C) and 11.9 kN static (C0), 0.8 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 137 g, 61814 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 70×90×10 mm envelope of 61814 gives a D/d ratio of 1.29 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.4/11.9 kN load ratings, 0.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 137 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6814LLU on the 70×90×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61814 in a rated drive.", "Standard catalogue stock of 61814 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61814 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61814-2RS-NTN bearing?", "a": "A 61814-2RS-NTN deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61814-2RS-NTN need?", "a": "61814-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61814 with a housing grease fitting instead." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61814?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6814LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×90×10 mm ISO 15 envelope." }, { "q": "Is 6814LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61814-llu", "6814llu", "61814-2RS", "61814-2rs", "6814LLU", "61814-2RS-NTN" ], "locale_variants": {} }, { "sku": "61814-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6814LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.4, "static_load_kN": 11.9, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 6900, "max_rpm": 6900, "weight_g": 137, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61814-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 90 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6814LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61814 against the shaft shoulder while it cools so the ring cannot creep back.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 70 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6214.", "RSR low-friction seals on 61814-RSR-NTN run faster than contact-seal 61814-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61814-2RS instead.", "The low-drag lip of 61814-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61814-RSR-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61814-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues this low-friction non-contact seal as 6814LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 70 mm bore 61814 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6900 r/min the grease limiting speed for 61814 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61814 at 13.4 kN dynamic (C) and 11.9 kN static (C0), 0.8 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 137 g, 61814 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 70×90×10 mm envelope of 61814 gives a D/d ratio of 1.29 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.4/11.9 kN load ratings, 0.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 6900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 137 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6814LLB on the 70×90×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61814 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61814 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61814-RSR-NTN bearing?", "a": "A 61814-RSR-NTN deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 61814-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61814-RSR-NTN need?", "a": "61814-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61814 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61814?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6814LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×90×10 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6814LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61814-llb", "6814llb", "61814-RSR", "61814-rsr", "6814LLB", "61814-RSR-NTN" ], "locale_variants": {} }, { "sku": "61814-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6814ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.4, "static_load_kN": 11.9, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 6900, "max_rpm": 6900, "weight_g": 137, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61814-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 90 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6814ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61814 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "ZZ shields are non-contact: 61814-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61814-2RS for that.", "Shielded 61814-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 61814-ZZ-NTN and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6814ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 70 mm bore 61814 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6900 r/min the grease limiting speed for 61814 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61814 at 13.4 kN dynamic (C) and 11.9 kN static (C0), 0.8 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 137 g, 61814 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 70×90×10 mm envelope of 61814 gives a D/d ratio of 1.29 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.4/11.9 kN load ratings, 0.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 6900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 137 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6814ZZ on the 70×90×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61814 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61814 is listed." ], "faq": [ { "q": "What are the dimensions of a 61814-ZZ-NTN bearing?", "a": "A 61814-ZZ-NTN deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61814-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 61814?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6814ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×90×10 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6814ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61814-zz", "6814zz", "61814-ZZ", "6814ZZ", "61814-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61914-NTN", "brand": "NTN", "manufacturer_designation": "6914", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 26.3, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.45, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 334, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61914-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 70×100×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61914 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 61914-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61914 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 61914 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6500 r/min the grease limiting speed for 61914 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 26.3 kN dynamic load rating (C) and 21.2 kN static (C0), 1.45 kN fatigue load limit Cu, 61914 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 334 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 26.3/21.2 kN load ratings, 1.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 334 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6914 on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61914 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61914-NTN bearing?", "a": "A 61914-NTN deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61914 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61914 uses the same ISO 15 envelope (70×100×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61914?", "a": "NTN lists the open 61914 under the bare designation 6914; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "Is 6914 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6914", "61914", "61914-NTN" ], "locale_variants": {} }, { "sku": "61914-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6914LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 26.3, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.45, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 334, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61914-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 100 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6914LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section at 70 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61914-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61914-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61914-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6914LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 70 mm bore 61914 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3700 r/min for 61914; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 26.3 kN dynamic load rating (C) and 21.2 kN static (C0), 1.45 kN fatigue load limit Cu, 61914 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 334 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 26.3/21.2 kN load ratings, 1.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 334 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6914LLU on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61914-2RS-NTN bearing?", "a": "A 61914-2RS-NTN deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61914-2RS-NTN need?", "a": "61914-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61914 with a housing grease fitting instead." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61914?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6914LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×100×16 mm ISO 15 envelope." }, { "q": "Does NTN offer 61914 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6914LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61914-llu", "6914llu", "61914-2RS", "61914-2rs", "6914LLU", "61914-2RS-NTN" ], "locale_variants": {} }, { "sku": "61914-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6914LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 26.3, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.45, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 334, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6914LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61914 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 70 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61914-RSR-NTN run faster than contact-seal 61914-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61914-2RS instead.", "The low-drag lip of 61914-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues this low-friction non-contact seal as 6914LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 70 mm bore 61914 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6500 r/min the grease limiting speed for 61914 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 26.3 kN dynamic load rating (C) and 21.2 kN static (C0), 1.45 kN fatigue load limit Cu, 61914 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 334 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 26.3/21.2 kN load ratings, 1.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 334 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6914LLB on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive.", "Standard catalogue stock of 61914 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61914 is listed." ], "faq": [ { "q": "What are the dimensions of a 61914-RSR-NTN bearing?", "a": "A 61914-RSR-NTN deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61914-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 61914-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61914 and verify the residual clearance after mounting." }, { "q": "How should 61914-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61914?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6914LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×100×16 mm ISO 15 envelope." }, { "q": "Is 6914LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61914-llb", "6914llb", "61914-RSR", "61914-rsr", "6914LLB", "61914-RSR-NTN" ], "locale_variants": {} }, { "sku": "61914-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6914ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 26.3, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.45, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 334, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61914-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 100 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6914ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61914 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Do not wash 61914-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61914-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61914-ZZ-NTN.", "NTN catalogues the shielded version as 6914ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 70 mm bore 61914 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6500 r/min the grease limiting speed for 61914 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 26.3 kN dynamic load rating (C) and 21.2 kN static (C0), 1.45 kN fatigue load limit Cu, 61914 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 334 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 26.3/21.2 kN load ratings, 1.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 334 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6914ZZ on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive.", "Order the C3 internal-clearance version (61914 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61914-ZZ-NTN bearing?", "a": "A 61914-ZZ-NTN deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61914 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61914 uses the same ISO 15 envelope (70×100×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61914-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61914-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61914 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61914?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6914ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×100×16 mm ISO 15 envelope." }, { "q": "Is 6914ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61914-zz", "6914zz", "61914-ZZ", "6914ZZ", "61914-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16014", "brand": "NTN", "manufacturer_designation": "16014", "series": "16000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 441, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 16014 with C3 clearance and re-check the residual value after mounting.", "Because the 160xx narrow section shares the 110 mm OD of the 6014 at 70 mm bore but is only 13 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16014 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×110×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16014 units.", "Vibration during standstill brinells the raceways of a 70 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Never mix components between two 16014 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 16014 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 16014 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 16014 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27 kN dynamic load rating (C) and 22.6 kN static (C0), 1.52 kN fatigue load limit Cu, 16014 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 441 g, 16014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×110×13 mm envelope of 16014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 441 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16014 on the 70×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16014 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (16014 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16014 bearing?", "a": "A 16014 deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 13 mm width (2.756 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 70 mm bore?", "a": "160 is the narrow extra-light section: 110×13 mm with a 20.0 mm radial section at 70 mm bore. It has the same bore and outside diameter as the 6014 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16014 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16014 uses the same ISO 15 envelope (70×110×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16014?", "a": "NTN lists the open 16014 under the bare designation 16014; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "Does NTN offer 16014 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16014 is the correct choice." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16014" ], "locale_variants": {} }, { "sku": "6014-NTN", "brand": "NTN", "manufacturer_designation": "6014", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42, "static_load_kN": 31, "fatigue_load_limit_kN": 2.3, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 604, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6014 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6014 against the shaft shoulder while it cools so the ring cannot creep back.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6014-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6014 units.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6014-NTN.", "Vibration during standstill brinells the raceways of a 70 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6014 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 6014 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 6014 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6014 at 42 kN dynamic (C) and 31 kN static (C0), 2.3 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 604 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 42/31 kN load ratings, 2.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 604 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6014 on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive.", "Order the C3 internal-clearance version (6014 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6014-NTN bearing?", "a": "A 6014-NTN deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6014-NTN have?", "a": "Unless a clearance suffix says otherwise, 6014-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6014 and verify the residual clearance after mounting." }, { "q": "How should 6014-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6014?", "a": "NTN lists the open 6014 under the bare designation 6014; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "Is 6014 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6014", "6014-NTN" ], "locale_variants": {} }, { "sku": "6014-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6014LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42, "static_load_kN": 31, "fatigue_load_limit_kN": 2.3, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 604, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6014-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6014LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6014 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6014-2RS-NTN runs slower and cooler-limited than the open 6014; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6014-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6014-2RS-NTN.", "NTN catalogues the contact-sealed version as 6014LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 70 mm bore 6014 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6014; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6014 at 42 kN dynamic (C) and 31 kN static (C0), 2.3 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 604 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 42/31 kN load ratings, 2.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 604 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6014LLU on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6014-2RS-NTN bearing?", "a": "A 6014-2RS-NTN deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6014-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6014-2RS-NTN need?", "a": "6014-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6014 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6014?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6014LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×110×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 6014 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6014LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6014-llu", "6014llu", "6014-2RS", "6014-2rs", "6014LLU", "6014-2RS-NTN" ], "locale_variants": {} }, { "sku": "6014-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6014LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42, "static_load_kN": 31, "fatigue_load_limit_kN": 2.3, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 604, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6014-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6014LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6014 against the shaft shoulder while it cools so the ring cannot creep back.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6014-RSR-NTN run faster than contact-seal 6014-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6014-2RS instead.", "The low-drag lip of 6014-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6014-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues this low-friction non-contact seal as 6014LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 70 mm bore 6014 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 6014 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6014 at 42 kN dynamic (C) and 31 kN static (C0), 2.3 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 604 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 42/31 kN load ratings, 2.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 604 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6014LLB on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6014-RSR-NTN bearing?", "a": "A 6014-RSR-NTN deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6014-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 6014?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6014LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×110×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 6014 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6014LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6014-llb", "6014llb", "6014-RSR", "6014-rsr", "6014LLB", "6014-RSR-NTN" ], "locale_variants": {} }, { "sku": "6014-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6014ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42, "static_load_kN": 31, "fatigue_load_limit_kN": 2.3, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 604, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6014ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6014 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 70 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6214 before committing to the smaller envelope.", "Do not wash 6014-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6014-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6014-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6014ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 70 mm bore 6014 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 6014 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6014 at 42 kN dynamic (C) and 31 kN static (C0), 2.3 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 604 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 42/31 kN load ratings, 2.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 604 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6014ZZ on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6014 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6014-ZZ-NTN bearing?", "a": "A 6014-ZZ-NTN deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6014-ZZ-NTN need?", "a": "6014-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6014?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6014ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×110×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 6014 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6014ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6014-zz", "6014zz", "6014-ZZ", "6014ZZ", "6014-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6214-NTN", "brand": "NTN", "manufacturer_designation": "6214", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6214 with C3 clearance and re-check the residual value after mounting.", "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6214-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6214 units.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6214-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6214 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 6214 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 6214 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6214 at 69 kN dynamic (C) and 44 kN static (C0), 3.45 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6214 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 69/44 kN load ratings, 3.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6214 on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6214 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6214-NTN bearing?", "a": "A 6214-NTN deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6214 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6214 uses the same ISO 15 envelope (70×125×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6214-NTN have?", "a": "Unless a clearance suffix says otherwise, 6214-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6214 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6214?", "a": "NTN lists the open 6214 under the bare designation 6214; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "What cage does NTN fit in 6214?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6214", "6214-NTN" ], "locale_variants": {} }, { "sku": "6214-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6214LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6214LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6214 against the shaft shoulder while it cools so the ring cannot creep back.", "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6214-2RS-NTN runs slower and cooler-limited than the open 6214; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6214-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the contact-sealed version as 6214LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 70 mm bore 6214 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3400 r/min for 6214; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6214 at 69 kN dynamic (C) and 44 kN static (C0), 3.45 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6214 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 69/44 kN load ratings, 3.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6214LLU on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6214 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6214-2RS-NTN bearing?", "a": "A 6214-2RS-NTN deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6214 bore code work?", "a": "The last two digits of 6214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6214-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6214?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6214LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×125×24 mm ISO 15 envelope." }, { "q": "Does NTN offer 6214 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6214LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6214-llu", "6214llu", "6214-2RS", "6214-2rs", "6214LLU", "6214-2RS-NTN" ], "locale_variants": {} }, { "sku": "6214-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6214LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6214LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6214 against the shaft shoulder while it cools so the ring cannot creep back.", "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6214-RSR-NTN run faster than contact-seal 6214-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6214-2RS instead.", "The low-drag lip of 6214-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues this low-friction non-contact seal as 6214LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 70 mm bore 6214 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 6214 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6214 at 69 kN dynamic (C) and 44 kN static (C0), 3.45 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6214 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 69/44 kN load ratings, 3.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6214LLB on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6214-RSR-NTN bearing?", "a": "A 6214-RSR-NTN deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6214-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 70 mm bore?", "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6214?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6214LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×125×24 mm ISO 15 envelope." }, { "q": "Does NTN offer 6214 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6214LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6214-llb", "6214llb", "6214-RSR", "6214-rsr", "6214LLB", "6214-RSR-NTN" ], "locale_variants": {} }, { "sku": "6214-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6214ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6214-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 125 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6214ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6214-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6214-2RS for that.", "Do not wash 6214-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6214ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 70 mm bore 6214 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 6214 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6214 at 69 kN dynamic (C) and 44 kN static (C0), 3.45 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6214 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 69/44 kN load ratings, 3.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6214ZZ on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6214 is listed." ], "faq": [ { "q": "What are the dimensions of a 6214-ZZ-NTN bearing?", "a": "A 6214-ZZ-NTN deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6214-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6214-ZZ-NTN need?", "a": "6214-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 6214?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6214ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×125×24 mm ISO 15 envelope." }, { "q": "Does NTN offer 6214 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6214ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6214-zz", "6214zz", "6214-ZZ", "6214ZZ", "6214-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6314-NTN", "brand": "NTN", "manufacturer_designation": "6314", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "limiting_speed_rpm": 4600, "max_rpm": 4600, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6314 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium section at 70 mm bore gains dynamic rating through larger rolling elements on a 150 mm OD; the penalty is mass and a lower limiting speed than the 6214 — do not specify it for speed-critical shafts.", "The open 6314-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 70×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6314 units.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6314-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6314 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 6314 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4600 r/min for 6314; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 115 kN dynamic load rating (C) and 68 kN static (C0), 5.1 kN fatigue load limit Cu, 6314 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2520 g (2.5 kg), 6314 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 115/68 kN load ratings, 5.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6314 on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 6314 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6314-NTN bearing?", "a": "A 6314-NTN deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6314 mean?", "a": "A bare 6314 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN order number for an open 6314?", "a": "NTN lists the open 6314 under the bare designation 6314; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "What cage does NTN fit in 6314?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6314", "6314-NTN" ], "locale_variants": {} }, { "sku": "6314-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6314LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6314LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "Contact seals add drag and heat: 6314-2RS-NTN runs slower and cooler-limited than the open 6314; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6314-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6314-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6314LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 70 mm bore 6314 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3100 r/min for 6314; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 115 kN dynamic load rating (C) and 68 kN static (C0), 5.1 kN fatigue load limit Cu, 6314 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2520 g (2.5 kg), 6314 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 115/68 kN load ratings, 5.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 3100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6314LLU on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6314-2RS-NTN bearing?", "a": "A 6314-2RS-NTN deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6314-2RS-NTN need?", "a": "6314-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6314 with a housing grease fitting instead." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6314?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6314LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×150×35 mm ISO 15 envelope." }, { "q": "Does NTN offer 6314 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6314LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6314-llu", "6314llu", "6314-2RS", "6314-2rs", "6314LLU", "6314-2RS-NTN" ], "locale_variants": {} }, { "sku": "6314-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6314LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "limiting_speed_rpm": 4600, "max_rpm": 4600, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6314LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6314 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "RSR low-friction seals on 6314-RSR-NTN run faster than contact-seal 6314-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6314-2RS instead.", "The non-contact lip of 6314-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6314-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues this low-friction non-contact seal as 6314LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 70 mm bore 6314 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4600 r/min for 6314; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 115 kN dynamic load rating (C) and 68 kN static (C0), 5.1 kN fatigue load limit Cu, 6314 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2520 g (2.5 kg), 6314 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 115/68 kN load ratings, 5.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6314LLB on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive.", "Order the C3 internal-clearance version (6314 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6314-RSR-NTN bearing?", "a": "A 6314-RSR-NTN deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6314-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 6314?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6314LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×150×35 mm ISO 15 envelope." }, { "q": "Does NTN offer 6314 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6314LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6314-llb", "6314llb", "6314-RSR", "6314-rsr", "6314LLB", "6314-RSR-NTN" ], "locale_variants": {} }, { "sku": "6314-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6314ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "limiting_speed_rpm": 4600, "max_rpm": 4600, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6314-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 150 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6314ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6314 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 70 mm bore gains dynamic rating through larger rolling elements on a 150 mm OD; the penalty is mass and a lower limiting speed than the 6214 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6314-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6314-2RS for that.", "Shielded 6314-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6314ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 70 mm bore 6314 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4600 r/min for 6314; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 115 kN dynamic load rating (C) and 68 kN static (C0), 5.1 kN fatigue load limit Cu, 6314 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2520 g (2.5 kg), 6314 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 115/68 kN load ratings, 5.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6314ZZ on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6314 is listed.", "Order the C3 internal-clearance version (6314 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6314-ZZ-NTN bearing?", "a": "A 6314-ZZ-NTN deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6314 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6314 uses the same ISO 15 envelope (70×150×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6314?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6314ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×150×35 mm ISO 15 envelope." }, { "q": "Does NTN offer 6314 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6314ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6314-zz", "6314zz", "6314-ZZ", "6314ZZ", "6314-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6414-NTN", "brand": "NTN", "manufacturer_designation": "6414", "series": "6400-series", "type": "deep_groove", "d_mm": 70, "D_mm": 180, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 142, "static_load_kN": 89.5, "fatigue_load_limit_kN": 6.25, "limiting_speed_rpm": 4100, "max_rpm": 4100, "weight_g": 4830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6414 against the shaft shoulder while it cools so the ring cannot creep back.", "The 64xx heavy section at 70 mm bore exists for high radial load at moderate rpm; its 180 mm OD and 42 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Storage matters for open bearings: 6414-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6414 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 180 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6414-NTN.", "The open 6414 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 6414 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4100 r/min for 6414; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 142 kN dynamic load rating (C) and 89.5 kN static (C0), 6.25 kN fatigue load limit Cu, 6414 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4830 g (4.8 kg), 6414 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×180×42 mm envelope of 6414 gives a D/d ratio of 2.57 and 55.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 142/89.5 kN load ratings, 6.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 4100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4830 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6414 on the 70×180×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6414 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6414-NTN bearing?", "a": "A 6414-NTN deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6414-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6414-NTN need?", "a": "The open 6414-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6414?", "a": "NTN lists the open 6414 under the bare designation 6414; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "Is 6414 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6414-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6414-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6414", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6414", "6414-NTN" ], "locale_variants": {} }, { "sku": "61815-NTN", "brand": "NTN", "manufacturer_designation": "6815", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.9, "static_load_kN": 12.9, "fatigue_load_limit_kN": 0.85, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 145, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61815 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 95 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61815 with C3 for those conditions.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 75 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.", "Storage matters for open bearings: 61815-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61815 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61815 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 61815 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6400 r/min the grease limiting speed for 61815 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61815 at 13.9 kN dynamic (C) and 12.9 kN static (C0), 0.85 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 145 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.9/12.9 kN load ratings, 0.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 145 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6815 on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61815 is listed." ], "faq": [ { "q": "What are the dimensions of a 61815-NTN bearing?", "a": "A 61815-NTN deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61815 mean?", "a": "A bare 61815 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN order number for an open 61815?", "a": "NTN lists the open 61815 under the bare designation 6815; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "What cage does NTN fit in 6815?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6815", "61815", "61815-NTN" ], "locale_variants": {} }, { "sku": "61815-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6815LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.9, "static_load_kN": 12.9, "fatigue_load_limit_kN": 0.85, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 145, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6815LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61815 with C3 clearance and re-check the residual value after mounting.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 75 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.", "Heat is the enemy of the sealed 61815-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61815-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61815-2RS-NTN drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61815-2RS-NTN.", "NTN catalogues the contact-sealed version as 6815LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 75 mm bore 61815 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 61815; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61815 at 13.9 kN dynamic (C) and 12.9 kN static (C0), 0.85 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 145 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.9/12.9 kN load ratings, 0.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 145 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6815LLU on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61815 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61815-2RS-NTN bearing?", "a": "A 61815-2RS-NTN deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61815-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61815-2RS-NTN need?", "a": "61815-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61815 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61815?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6815LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×95×10 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6815LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-llu", "6815llu", "61815-2RS", "61815-2rs", "6815LLU", "61815-2RS-NTN" ], "locale_variants": {} }, { "sku": "61815-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6815LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.9, "static_load_kN": 12.9, "fatigue_load_limit_kN": 0.85, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 145, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61815-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 95 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6815LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61815 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "The low-drag lip of 61815-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61815-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61815-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61815-RSR-NTN drags the lip and overheats it.", "NTN catalogues this low-friction non-contact seal as 6815LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 75 mm bore 61815 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6400 r/min the grease limiting speed for 61815 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61815 at 13.9 kN dynamic (C) and 12.9 kN static (C0), 0.85 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 145 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.9/12.9 kN load ratings, 0.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 145 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6815LLB on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive.", "Order the C3 internal-clearance version (61815 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61815-RSR-NTN bearing?", "a": "A 61815-RSR-NTN deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61815-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 61815?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6815LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×95×10 mm ISO 15 envelope." }, { "q": "Does NTN offer 61815 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6815LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-llb", "6815llb", "61815-RSR", "61815-rsr", "6815LLB", "61815-RSR-NTN" ], "locale_variants": {} }, { "sku": "61815-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6815ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.9, "static_load_kN": 12.9, "fatigue_load_limit_kN": 0.85, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 145, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6815ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61815 with C3 clearance and re-check the residual value after mounting.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 75 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.", "ZZ shields are non-contact: 61815-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61815-2RS for that.", "Shielded 61815-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61815-ZZ-NTN drags the lip and overheats it.", "NTN catalogues the shielded version as 6815ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 75 mm bore 61815 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6400 r/min the grease limiting speed for 61815 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61815 at 13.9 kN dynamic (C) and 12.9 kN static (C0), 0.85 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 145 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.9/12.9 kN load ratings, 0.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 145 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6815ZZ on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61815-ZZ-NTN bearing?", "a": "A 61815-ZZ-NTN deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61815 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61815 uses the same ISO 15 envelope (75×95×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61815-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61815-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61815 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61815?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6815ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×95×10 mm ISO 15 envelope." }, { "q": "Is 6815ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-zz", "6815zz", "61815-ZZ", "6815ZZ", "61815-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61915-NTN", "brand": "NTN", "manufacturer_designation": "6915", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61915 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 105 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61915 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 75 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61915-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 75×105×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61915-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61915-NTN.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61915 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 61915 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 61915 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27 kN dynamic load rating (C) and 22.6 kN static (C0), 1.52 kN fatigue load limit Cu, 61915 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 353 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 353 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6915 on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61915 is listed.", "Standard catalogue stock of 61915 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61915-NTN bearing?", "a": "A 61915-NTN deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61915-NTN have?", "a": "Unless a clearance suffix says otherwise, 61915-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61915 and verify the residual clearance after mounting." }, { "q": "How should 61915-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61915?", "a": "NTN lists the open 61915 under the bare designation 6915; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "Is 6915 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6915", "61915", "61915-NTN" ], "locale_variants": {} }, { "sku": "61915-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6915LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6915LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61915 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61915-2RS-NTN runs slower and cooler-limited than the open 61915; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61915-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 61915-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6915LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 75 mm bore 61915 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 61915; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27 kN dynamic load rating (C) and 22.6 kN static (C0), 1.52 kN fatigue load limit Cu, 61915 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 353 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 353 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6915LLU on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive.", "Order the C3 internal-clearance version (61915 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61915-2RS-NTN bearing?", "a": "A 61915-2RS-NTN deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61915-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61915-2RS-NTN need?", "a": "61915-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61915 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61915?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6915LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×105×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6915LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61915-llu", "6915llu", "61915-2RS", "61915-2rs", "6915LLU", "61915-2RS-NTN" ], "locale_variants": {} }, { "sku": "61915-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6915LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6915LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61915 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61915-RSR-NTN run faster than contact-seal 61915-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61915-2RS instead.", "The non-contact lip of 61915-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 105 mm OD should be round within IT7; an oval bore pinches the outer ring of 61915-RSR-NTN and shows up later as two-point loaded raceway wear.", "Never mix components between two 61915-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues this low-friction non-contact seal as 6915LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 75 mm bore 61915 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 61915 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27 kN dynamic load rating (C) and 22.6 kN static (C0), 1.52 kN fatigue load limit Cu, 61915 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 353 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 353 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6915LLB on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive.", "Standard catalogue stock of 61915 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61915-RSR-NTN bearing?", "a": "A 61915-RSR-NTN deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61915-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 61915-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61915 and verify the residual clearance after mounting." }, { "q": "How should 61915-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61915?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6915LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×105×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6915LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61915-llb", "6915llb", "61915-RSR", "61915-rsr", "6915LLB", "61915-RSR-NTN" ], "locale_variants": {} }, { "sku": "61915-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6915ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6915ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61915 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 75 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Do not wash 61915-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61915-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61915-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61915-ZZ-NTN.", "NTN catalogues the shielded version as 6915ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 75 mm bore 61915 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 61915 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27 kN dynamic load rating (C) and 22.6 kN static (C0), 1.52 kN fatigue load limit Cu, 61915 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 353 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 353 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6915ZZ on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive.", "Standard catalogue stock of 61915 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61915-ZZ-NTN bearing?", "a": "A 61915-ZZ-NTN deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61915-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61915-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61915 and verify the residual clearance after mounting." }, { "q": "How should 61915-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61915?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6915ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×105×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6915ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61915-zz", "6915zz", "61915-ZZ", "6915ZZ", "61915-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16015", "brand": "NTN", "manufacturer_designation": "16015", "series": "16000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 464, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16015 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16015 with C3 for those conditions.", "The 160xx narrow section at 75 mm bore shares the 115 mm outside diameter of the 6015 but is only 13 mm wide; a 6015 in a 13 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16015 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×115×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16015 units.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 16015 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 16015 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 16015 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27.6 kN dynamic load rating (C) and 24 kN static (C0), 1.6 kN fatigue load limit Cu, 16015 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 464 g, 16015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×115×13 mm envelope of 16015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27.6/24 kN load ratings, 1.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 464 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16015 on the 75×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16015 in a rated drive.", "Standard catalogue stock of 16015 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16015 bearing?", "a": "A 16015 deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 13 mm width (2.953 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 75 mm bore?", "a": "160 is the narrow extra-light section: 115×13 mm with a 20.0 mm radial section at 75 mm bore. It has the same bore and outside diameter as the 6015 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16015 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16015 uses the same ISO 15 envelope (75×115×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16015?", "a": "NTN lists the open 16015 under the bare designation 16015; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "Is 16015 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16015" ], "locale_variants": {} }, { "sku": "6015-NTN", "brand": "NTN", "manufacturer_designation": "6015", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 649, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6015-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 75×115×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6015 units.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6015-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6015 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 6015 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 6015 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6015 at 44 kN dynamic (C) and 33.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 44/33.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 649 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6015 on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6015 is listed." ], "faq": [ { "q": "What are the dimensions of a 6015-NTN bearing?", "a": "A 6015-NTN deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6015 mean?", "a": "A bare 6015 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6015?", "a": "NTN lists the open 6015 under the bare designation 6015; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "Is 6015 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6015", "6015-NTN" ], "locale_variants": {} }, { "sku": "6015-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6015LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 3300, "max_rpm": 3300, "weight_g": 649, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6015LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6015 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "Heat is the enemy of the sealed 6015-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6015-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6015LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 75 mm bore 6015 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3300 r/min for 6015; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6015 at 44 kN dynamic (C) and 33.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 44/33.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 3300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 649 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6015LLU on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6015 is listed.", "Standard catalogue stock of 6015 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6015-2RS-NTN bearing?", "a": "A 6015-2RS-NTN deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6015-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6015?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6015LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×115×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 6015 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6015LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6015-llu", "6015llu", "6015-2RS", "6015-2rs", "6015LLU", "6015-2RS-NTN" ], "locale_variants": {} }, { "sku": "6015-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6015LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 649, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6015-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6015LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6015-RSR-NTN run faster than contact-seal 6015-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6015-2RS instead.", "The non-contact lip of 6015-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 115 mm OD should be round within IT7; an oval bore pinches the outer ring of 6015-RSR-NTN and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6015-RSR-NTN.", "NTN catalogues this low-friction non-contact seal as 6015LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 75 mm bore 6015 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 6015 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6015 at 44 kN dynamic (C) and 33.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 44/33.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 649 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6015LLB on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6015 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6015-RSR-NTN bearing?", "a": "A 6015-RSR-NTN deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6015-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN suffix for a sealed 6015?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6015LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×115×20 mm ISO 15 envelope." }, { "q": "Is 6015LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6015-llb", "6015llb", "6015-RSR", "6015-rsr", "6015LLB", "6015-RSR-NTN" ], "locale_variants": {} }, { "sku": "6015-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6015ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 649, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6015-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6015ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6015 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "Do not wash 6015-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6015-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6015ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 75 mm bore 6015 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 6015 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6015 at 44 kN dynamic (C) and 33.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 44/33.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 649 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6015ZZ on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive.", "Standard catalogue stock of 6015 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6015-ZZ-NTN bearing?", "a": "A 6015-ZZ-NTN deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6015 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6015 uses the same ISO 15 envelope (75×115×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6015-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6015-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6015 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6015?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6015ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×115×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 6015 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6015ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6015-zz", "6015zz", "6015-ZZ", "6015ZZ", "6015-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6215-NTN", "brand": "NTN", "manufacturer_designation": "6215", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 1180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6215 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 130 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6215 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "The open 6215-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 75×130×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6215 units.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6215 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 6215 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 6215; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 73.5 kN dynamic load rating (C) and 49.5 kN static (C0), 3.8 kN fatigue load limit Cu, 6215 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1180 g (1.2 kg), 6215 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 73.5/49.5 kN load ratings, 3.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6215 on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive.", "Standard catalogue stock of 6215 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6215 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6215-NTN bearing?", "a": "A 6215-NTN deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6215-NTN need?", "a": "The open 6215-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6215?", "a": "NTN lists the open 6215 under the bare designation 6215; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "Does NTN offer 6215 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6215 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6215", "6215-NTN" ], "locale_variants": {} }, { "sku": "6215-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6215LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 1180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6215-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 130 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6215LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "At 75 mm bore the 62xx light series is the workhorse section; its 130×25 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6215-2RS-NTN runs slower and cooler-limited than the open 6215; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6215-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6215-2RS-NTN.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6215LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 75 mm bore 6215 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6215; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 73.5 kN dynamic load rating (C) and 49.5 kN static (C0), 3.8 kN fatigue load limit Cu, 6215 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1180 g (1.2 kg), 6215 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 73.5/49.5 kN load ratings, 3.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6215LLU on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive.", "Standard catalogue stock of 6215 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6215-2RS-NTN bearing?", "a": "A 6215-2RS-NTN deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6215-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6215-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6215 and verify the residual clearance after mounting." }, { "q": "How should 6215-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6215?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6215LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×130×25 mm ISO 15 envelope." }, { "q": "Does NTN offer 6215 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6215LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6215-llu", "6215llu", "6215-2RS", "6215-2rs", "6215LLU", "6215-2RS-NTN" ], "locale_variants": {} }, { "sku": "6215-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6215LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 1180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6215LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6215 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6215-RSR-NTN run faster than contact-seal 6215-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6215-2RS instead.", "The low-drag lip of 6215-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6215-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 25 mm-wide ring of 6215-RSR-NTN drags the lip and overheats it.", "NTN catalogues this low-friction non-contact seal as 6215LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 75 mm bore 6215 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 6215; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 73.5 kN dynamic load rating (C) and 49.5 kN static (C0), 3.8 kN fatigue load limit Cu, 6215 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1180 g (1.2 kg), 6215 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 73.5/49.5 kN load ratings, 3.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6215LLB on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6215-RSR-NTN bearing?", "a": "A 6215-RSR-NTN deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6215-RSR-NTN need?", "a": "6215-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6215 with a housing grease fitting instead." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6215?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6215LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×130×25 mm ISO 15 envelope." }, { "q": "Is 6215LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6215-llb", "6215llb", "6215-RSR", "6215-rsr", "6215LLB", "6215-RSR-NTN" ], "locale_variants": {} }, { "sku": "6215-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6215ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 1180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6215ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6215 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "Do not wash 6215-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6215-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6215ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 75 mm bore 6215 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 6215; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 73.5 kN dynamic load rating (C) and 49.5 kN static (C0), 3.8 kN fatigue load limit Cu, 6215 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1180 g (1.2 kg), 6215 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 73.5/49.5 kN load ratings, 3.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6215ZZ on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6215-ZZ-NTN bearing?", "a": "A 6215-ZZ-NTN deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6215-ZZ-NTN need?", "a": "6215-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6215?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6215ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×130×25 mm ISO 15 envelope." }, { "q": "Does NTN offer 6215 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6215ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6215-zz", "6215zz", "6215-ZZ", "6215ZZ", "6215-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6315-NTN", "brand": "NTN", "manufacturer_designation": "6315", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6315 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "The open 6315-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 75×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6315-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6315-NTN.", "The open 6315 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 6315 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 6315; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 126 kN dynamic load rating (C) and 77 kN static (C0), 5.55 kN fatigue load limit Cu, 6315 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3020 g (3.0 kg), 6315 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 126/77 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3020 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6315 on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive.", "Standard catalogue stock of 6315 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6315-NTN bearing?", "a": "A 6315-NTN deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6315-NTN have?", "a": "Unless a clearance suffix says otherwise, 6315-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6315 and verify the residual clearance after mounting." }, { "q": "How should 6315-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6315?", "a": "NTN lists the open 6315 under the bare designation 6315; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "Does NTN offer 6315 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6315 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6315", "6315-NTN" ], "locale_variants": {} }, { "sku": "6315-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6315LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 3020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6315LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6315 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6315-2RS-NTN runs slower and cooler-limited than the open 6315; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6315-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 160 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6315-2RS-NTN.", "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6315-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6315LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 75 mm bore 6315 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6315; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 126 kN dynamic load rating (C) and 77 kN static (C0), 5.55 kN fatigue load limit Cu, 6315 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3020 g (3.0 kg), 6315 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 126/77 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3020 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6315LLU on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6315 is listed." ], "faq": [ { "q": "What are the dimensions of a 6315-2RS-NTN bearing?", "a": "A 6315-2RS-NTN deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6315 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6315 uses the same ISO 15 envelope (75×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6315-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6315-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6315 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6315?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6315LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×160×37 mm ISO 15 envelope." }, { "q": "Does NTN offer 6315 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6315LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6315-llu", "6315llu", "6315-2RS", "6315-2rs", "6315LLU", "6315-2RS-NTN" ], "locale_variants": {} }, { "sku": "6315-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6315LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6315LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "RSR low-friction seals on 6315-RSR-NTN run faster than contact-seal 6315-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6315-2RS instead.", "The low-drag lip of 6315-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Never mix components between two 6315-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 37 mm-wide ring of 6315-RSR-NTN drags the lip and overheats it.", "NTN catalogues this low-friction non-contact seal as 6315LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 75 mm bore 6315 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 6315; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 126 kN dynamic load rating (C) and 77 kN static (C0), 5.55 kN fatigue load limit Cu, 6315 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3020 g (3.0 kg), 6315 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 126/77 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3020 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6315LLB on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6315 is listed." ], "faq": [ { "q": "What are the dimensions of a 6315-RSR-NTN bearing?", "a": "A 6315-RSR-NTN deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6315-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN suffix for a sealed 6315?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6315LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×160×37 mm ISO 15 envelope." }, { "q": "Is 6315LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6315-llb", "6315llb", "6315-RSR", "6315-rsr", "6315LLB", "6315-RSR-NTN" ], "locale_variants": {} }, { "sku": "6315-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6315ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6315-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 160 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6315ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6315-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6315-2RS for that.", "Do not wash 6315-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6315-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6315ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 75 mm bore 6315 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 6315; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 126 kN dynamic load rating (C) and 77 kN static (C0), 5.55 kN fatigue load limit Cu, 6315 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3020 g (3.0 kg), 6315 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 126/77 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3020 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6315ZZ on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6315 is listed." ], "faq": [ { "q": "What are the dimensions of a 6315-ZZ-NTN bearing?", "a": "A 6315-ZZ-NTN deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6315-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6315-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6315 and verify the residual clearance after mounting." }, { "q": "How should 6315-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6315?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6315ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×160×37 mm ISO 15 envelope." }, { "q": "Is 6315ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6315-zz", "6315zz", "6315-ZZ", "6315ZZ", "6315-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6415-NTN", "brand": "NTN", "manufacturer_designation": "6415", "series": "6400-series", "type": "deep_groove", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 152, "static_load_kN": 99, "fatigue_load_limit_kN": 6.7, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 5720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6415 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 190 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.", "The 64xx heavy section at 75 mm bore (190 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6415-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6415 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6415-NTN drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6415-NTN.", "The open 6415 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 6415 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 6415; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 152 kN dynamic load rating (C) and 99 kN static (C0), 6.7 kN fatigue load limit Cu, 6415 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5720 g (5.7 kg), 6415 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 75×190×45 mm envelope of 6415 gives a D/d ratio of 2.53 and 57.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 152/99 kN load ratings, 6.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5720 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6415 on the 75×190×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6415 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6415 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6415-NTN bearing?", "a": "A 6415-NTN deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6415-NTN have?", "a": "Unless a clearance suffix says otherwise, 6415-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6415 and verify the residual clearance after mounting." }, { "q": "How should 6415-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6415?", "a": "NTN lists the open 6415 under the bare designation 6415; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "What cage does NTN fit in 6415?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6415-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6415-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6415", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6415", "6415-NTN" ], "locale_variants": {} }, { "sku": "61816-NTN", "brand": "NTN", "manufacturer_designation": "6816", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.89, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 154, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61816 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 100 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 80 mm of 61816-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "The open 61816-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 80×100×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61816-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61816 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 61816 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6000 r/min the grease limiting speed for 61816 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61816 at 14 kN dynamic (C) and 13.3 kN static (C0), 0.89 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 154 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 14/13.3 kN load ratings, 0.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 6000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 154 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6816 on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61816-NTN bearing?", "a": "A 61816-NTN deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61816 mean?", "a": "A bare 61816 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 61816?", "a": "NTN lists the open 61816 under the bare designation 6816; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "What cage does NTN fit in 6816?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6816", "61816", "61816-NTN" ], "locale_variants": {} }, { "sku": "61816-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6816LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.89, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 154, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6816LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 80 mm of 61816-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 80 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6216.", "Heat is the enemy of the sealed 61816-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61816-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61816-2RS-NTN.", "NTN catalogues the contact-sealed version as 6816LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 80 mm bore 61816 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3400 r/min for 61816; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61816 at 14 kN dynamic (C) and 13.3 kN static (C0), 0.89 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 154 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 14/13.3 kN load ratings, 0.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 154 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6816LLU on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive.", "Standard catalogue stock of 61816 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61816 is listed." ], "faq": [ { "q": "What are the dimensions of a 61816-2RS-NTN bearing?", "a": "A 61816-2RS-NTN deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61816-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61816-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61816 and verify the residual clearance after mounting." }, { "q": "How should 61816-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61816?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6816LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×100×10 mm ISO 15 envelope." }, { "q": "Is 6816LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61816-llu", "6816llu", "61816-2RS", "61816-2rs", "6816LLU", "61816-2RS-NTN" ], "locale_variants": {} }, { "sku": "61816-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6816LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.89, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 154, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6816LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 80 mm of 61816-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 80 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6216.", "RSR low-friction seals on 61816-RSR-NTN run faster than contact-seal 61816-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61816-2RS instead.", "The low-drag lip of 61816-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61816-RSR-NTN.", "NTN catalogues this low-friction non-contact seal as 6816LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 80 mm bore 61816 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6000 r/min the grease limiting speed for 61816 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61816 at 14 kN dynamic (C) and 13.3 kN static (C0), 0.89 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 154 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 14/13.3 kN load ratings, 0.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 6000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 154 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6816LLB on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61816-RSR-NTN bearing?", "a": "A 61816-RSR-NTN deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61816 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61816 uses the same ISO 15 envelope (80×100×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61816?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6816LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×100×10 mm ISO 15 envelope." }, { "q": "Is 6816LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61816-llb", "6816llb", "61816-RSR", "61816-rsr", "6816LLB", "61816-RSR-NTN" ], "locale_variants": {} }, { "sku": "61816-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6816ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.89, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 154, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61816-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 100 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6816ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 61816 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 80 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6216.", "ZZ shields are non-contact: 61816-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61816-2RS for that.", "Shielded 61816-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61816-ZZ-NTN.", "NTN catalogues the shielded version as 6816ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 80 mm bore 61816 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6000 r/min the grease limiting speed for 61816 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61816 at 14 kN dynamic (C) and 13.3 kN static (C0), 0.89 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 154 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 14/13.3 kN load ratings, 0.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 6000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 154 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6816ZZ on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61816 is listed." ], "faq": [ { "q": "What are the dimensions of a 61816-ZZ-NTN bearing?", "a": "A 61816-ZZ-NTN deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61816-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61816?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6816ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×100×10 mm ISO 15 envelope." }, { "q": "Is 6816ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61816-zz", "6816zz", "61816-ZZ", "6816ZZ", "61816-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61916-NTN", "brand": "NTN", "manufacturer_designation": "6916", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.59, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 373, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61916-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 80×110×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61916-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61916-NTN.", "The open 61916 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 61916 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61916 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27.6 kN dynamic load rating (C) and 24 kN static (C0), 1.59 kN fatigue load limit Cu, 61916 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 373 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.6/24 kN load ratings, 1.59 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 373 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6916 on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61916 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61916-NTN bearing?", "a": "A 61916-NTN deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61916-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61916-NTN need?", "a": "The open 61916-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61916?", "a": "NTN lists the open 61916 under the bare designation 6916; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "What cage does NTN fit in 6916?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6916", "61916", "61916-NTN" ], "locale_variants": {} }, { "sku": "61916-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6916LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.59, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 373, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6916LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61916-2RS-NTN runs slower and cooler-limited than the open 61916; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61916-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the contact-sealed version as 6916LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 80 mm bore 61916 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 61916; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27.6 kN dynamic load rating (C) and 24 kN static (C0), 1.59 kN fatigue load limit Cu, 61916 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 373 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.6/24 kN load ratings, 1.59 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 373 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6916LLU on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61916-2RS-NTN bearing?", "a": "A 61916-2RS-NTN deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61916-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61916-2RS-NTN need?", "a": "61916-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61916 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61916?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6916LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×110×16 mm ISO 15 envelope." }, { "q": "Is 6916LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-llu", "6916llu", "61916-2RS", "61916-2rs", "6916LLU", "61916-2RS-NTN" ], "locale_variants": {} }, { "sku": "61916-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6916LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.59, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 373, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61916-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 110 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6916LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 80 mm of 61916-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 80 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The low-drag lip of 61916-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61916-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61916-RSR-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues this low-friction non-contact seal as 6916LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 80 mm bore 61916 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61916 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27.6 kN dynamic load rating (C) and 24 kN static (C0), 1.59 kN fatigue load limit Cu, 61916 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 373 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.6/24 kN load ratings, 1.59 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 373 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6916LLB on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive.", "Order the C3 internal-clearance version (61916 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 61916 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61916-RSR-NTN bearing?", "a": "A 61916-RSR-NTN deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 61916-RSR-NTN need?", "a": "61916-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61916 with a housing grease fitting instead." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61916?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6916LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×110×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6916LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-llb", "6916llb", "61916-RSR", "61916-rsr", "6916LLB", "61916-RSR-NTN" ], "locale_variants": {} }, { "sku": "61916-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6916ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.59, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 373, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6916ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 61916 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 80 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Do not wash 61916-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61916-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6916ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 80 mm bore 61916 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61916 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27.6 kN dynamic load rating (C) and 24 kN static (C0), 1.59 kN fatigue load limit Cu, 61916 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 373 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.6/24 kN load ratings, 1.59 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 373 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6916ZZ on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive.", "Order the C3 internal-clearance version (61916 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61916-ZZ-NTN bearing?", "a": "A 61916-ZZ-NTN deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 61916-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61916-ZZ-NTN need?", "a": "61916-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 61916?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6916ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×110×16 mm ISO 15 envelope." }, { "q": "Is 6916ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-zz", "6916zz", "61916-ZZ", "6916ZZ", "61916-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16016", "brand": "NTN", "manufacturer_designation": "16016", "series": "16000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 25.1, "fatigue_load_limit_kN": 1.64, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 597, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16016 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 80 mm bore shares the 125 mm outside diameter of the 6016 but is only 14 mm wide; a 6016 in a 14 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16016 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×125×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16016 units.", "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16016-C3. No clearance suffix means normal CN clearance.", "The open 16016 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 16016 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5300 r/min the grease limiting speed for 16016 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 28.1 kN dynamic load rating (C) and 25.1 kN static (C0), 1.64 kN fatigue load limit Cu, 16016 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 597 g, 16016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×125×14 mm envelope of 16016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 28.1/25.1 kN load ratings, 1.64 kN fatigue load limit Cu NTN lists the grease limiting speed at 5300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 597 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16016 on the 80×125×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16016 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (16016 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16016 bearing?", "a": "A 16016 deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 14 mm width (3.15 × 4.921 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 80 mm bore?", "a": "160 is the narrow extra-light section: 125×14 mm with a 22.5 mm radial section at 80 mm bore. It has the same bore and outside diameter as the 6016 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16016 uses the same ISO 15 envelope (80×125×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16016?", "a": "NTN lists the open 16016 under the bare designation 16016; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "Is 16016 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16016" ], "locale_variants": {} }, { "sku": "6016-NTN", "brand": "NTN", "manufacturer_designation": "6016", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 40, "fatigue_load_limit_kN": 2.91, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 854, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6016 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 80 mm of 6016-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 80 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6216 before committing to the smaller envelope.", "The open 6016-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 80×125×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6016 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 6016-NTN drags the lip and overheats it.", "The open 6016 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 6016 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5300 r/min the grease limiting speed for 6016 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6016 at 53 kN dynamic (C) and 40 kN static (C0), 2.91 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 854 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 53/40 kN load ratings, 2.91 kN fatigue load limit Cu NTN lists the grease limiting speed at 5300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 854 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6016 on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive.", "Standard catalogue stock of 6016 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6016-NTN bearing?", "a": "A 6016-NTN deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6016 mean?", "a": "A bare 6016 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 80 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN order number for an open 6016?", "a": "NTN lists the open 6016 under the bare designation 6016; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "Does NTN offer 6016 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6016 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016", "equiv_brand": "SKF", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6016", "6016-NTN" ], "locale_variants": {} }, { "sku": "6016-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6016LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 40, "fatigue_load_limit_kN": 2.91, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 854, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6016-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6016LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6016 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6016-2RS-NTN runs slower and cooler-limited than the open 6016; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6016-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the contact-sealed version as 6016LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 80 mm bore 6016 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3100 r/min for 6016; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6016 at 53 kN dynamic (C) and 40 kN static (C0), 2.91 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 854 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 53/40 kN load ratings, 2.91 kN fatigue load limit Cu NTN lists the grease limiting speed at 3100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 854 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6016LLU on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive.", "Order the C3 internal-clearance version (6016 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6016-2RS-NTN bearing?", "a": "A 6016-2RS-NTN deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6016-2RS-NTN need?", "a": "6016-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6016 with a housing grease fitting instead." }, { "q": "How does the 6016 bore code work?", "a": "The last two digits of 6016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6016?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6016LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×125×22 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6016LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6016-llu", "6016llu", "6016-2RS", "6016-2rs", "6016LLU", "6016-2RS-NTN" ], "locale_variants": {} }, { "sku": "6016-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6016LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 40, "fatigue_load_limit_kN": 2.91, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 854, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6016LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 80 mm of 6016-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6016-RSR-NTN run faster than contact-seal 6016-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6016-2RS instead.", "The non-contact lip of 6016-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6016-RSR-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6016LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 80 mm bore 6016 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5300 r/min the grease limiting speed for 6016 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6016 at 53 kN dynamic (C) and 40 kN static (C0), 2.91 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 854 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 53/40 kN load ratings, 2.91 kN fatigue load limit Cu NTN lists the grease limiting speed at 5300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 854 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6016LLB on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6016 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6016-RSR-NTN bearing?", "a": "A 6016-RSR-NTN deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6016-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6016-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6016 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6016?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6016LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×125×22 mm ISO 15 envelope." }, { "q": "Does NTN offer 6016 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6016LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6016-llb", "6016llb", "6016-RSR", "6016-rsr", "6016LLB", "6016-RSR-NTN" ], "locale_variants": {} }, { "sku": "6016-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6016ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 40, "fatigue_load_limit_kN": 2.91, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 854, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6016-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6016ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 80 mm of 6016-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 80 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6216 before committing to the smaller envelope.", "ZZ shields are non-contact: 6016-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6016-2RS for that.", "Shielded 6016-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6016-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6016ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 80 mm bore 6016 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5300 r/min the grease limiting speed for 6016 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6016 at 53 kN dynamic (C) and 40 kN static (C0), 2.91 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 854 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 53/40 kN load ratings, 2.91 kN fatigue load limit Cu NTN lists the grease limiting speed at 5300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 854 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6016ZZ on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6016-ZZ-NTN bearing?", "a": "A 6016-ZZ-NTN deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6016-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6016-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6016 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6016?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6016ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×125×22 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6016ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6016-zz", "6016zz", "6016-ZZ", "6016ZZ", "6016-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6216-NTN", "brand": "NTN", "manufacturer_designation": "6216", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6216-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 80×140×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6216 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 6216-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6216 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 6216 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 6216; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 80.5 kN dynamic load rating (C) and 53 kN static (C0), 3.95 kN fatigue load limit Cu, 6216 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1400 g (1.4 kg), 6216 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 80.5/53 kN load ratings, 3.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6216 on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6216-NTN bearing?", "a": "A 6216-NTN deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "Are 6216 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6216 uses the same ISO 15 envelope (80×140×26 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6216?", "a": "NTN lists the open 6216 under the bare designation 6216; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "Does NTN offer 6216 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6216 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6216", "6216-NTN" ], "locale_variants": {} }, { "sku": "6216-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6216LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6216LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 80 mm of 6216-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6216-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6216-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6216-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6216-2RS-NTN.", "NTN catalogues the contact-sealed version as 6216LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 80 mm bore 6216 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3000 r/min for 6216; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 80.5 kN dynamic load rating (C) and 53 kN static (C0), 3.95 kN fatigue load limit Cu, 6216 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1400 g (1.4 kg), 6216 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 80.5/53 kN load ratings, 3.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6216LLU on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6216 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6216-2RS-NTN bearing?", "a": "A 6216-2RS-NTN deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6216-2RS-NTN need?", "a": "6216-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6216 with a housing grease fitting instead." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6216?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6216LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×140×26 mm ISO 15 envelope." }, { "q": "Is 6216LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6216-llu", "6216llu", "6216-2RS", "6216-2rs", "6216LLU", "6216-2RS-NTN" ], "locale_variants": {} }, { "sku": "6216-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6216LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6216LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6216-RSR-NTN run faster than contact-seal 6216-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6216-2RS instead.", "The low-drag lip of 6216-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6216-RSR-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6216LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 80 mm bore 6216 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 6216; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 80.5 kN dynamic load rating (C) and 53 kN static (C0), 3.95 kN fatigue load limit Cu, 6216 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1400 g (1.4 kg), 6216 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 80.5/53 kN load ratings, 3.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6216LLB on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 6216 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6216-RSR-NTN bearing?", "a": "A 6216-RSR-NTN deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6216-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6216-RSR-NTN need?", "a": "6216-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6216 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6216?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6216LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×140×26 mm ISO 15 envelope." }, { "q": "Does NTN offer 6216 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6216LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6216-llb", "6216llb", "6216-RSR", "6216-rsr", "6216LLB", "6216-RSR-NTN" ], "locale_variants": {} }, { "sku": "6216-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6216ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6216-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 140 mm outside diameter and 26 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6216ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6216-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6216-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6216-ZZ-NTN.", "NTN catalogues the shielded version as 6216ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 80 mm bore 6216 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 6216; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 80.5 kN dynamic load rating (C) and 53 kN static (C0), 3.95 kN fatigue load limit Cu, 6216 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1400 g (1.4 kg), 6216 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 80.5/53 kN load ratings, 3.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6216ZZ on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6216 is listed.", "Order the C3 internal-clearance version (6216 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6216-ZZ-NTN bearing?", "a": "A 6216-ZZ-NTN deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "Are 6216 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6216 uses the same ISO 15 envelope (80×140×26 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6216?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6216ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×140×26 mm ISO 15 envelope." }, { "q": "Does NTN offer 6216 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6216ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6216-zz", "6216zz", "6216-ZZ", "6216ZZ", "6216-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6316-NTN", "brand": "NTN", "manufacturer_designation": "6316", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6316 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 170 mm outside diameter and 39 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6316 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 80 mm bore gains dynamic rating through larger rolling elements on a 170 mm OD; the penalty is mass and a lower limiting speed than the 6216 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6316-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6316 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6316-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6316-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6316 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 6316 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6316; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 136 kN dynamic load rating (C) and 86.5 kN static (C0), 6.05 kN fatigue load limit Cu, 6316 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3590 g (3.6 kg), 6316 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 136/86.5 kN load ratings, 6.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3590 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6316 on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6316-NTN bearing?", "a": "A 6316-NTN deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6316 mean?", "a": "A bare 6316 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN order number for an open 6316?", "a": "NTN lists the open 6316 under the bare designation 6316; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "What cage does NTN fit in 6316?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6316", "6316-NTN" ], "locale_variants": {} }, { "sku": "6316-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6316LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 3590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6316-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 170 mm outside diameter and 39 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6316LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6316 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "Contact seals add drag and heat: 6316-2RS-NTN runs slower and cooler-limited than the open 6316; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6316-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6316LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 80 mm bore 6316 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2700 r/min for 6316; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 136 kN dynamic load rating (C) and 86.5 kN static (C0), 6.05 kN fatigue load limit Cu, 6316 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3590 g (3.6 kg), 6316 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 136/86.5 kN load ratings, 6.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3590 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6316LLU on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6316-2RS-NTN bearing?", "a": "A 6316-2RS-NTN deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6316-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6316?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6316LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×170×39 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6316LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6316-llu", "6316llu", "6316-2RS", "6316-2rs", "6316LLU", "6316-2RS-NTN" ], "locale_variants": {} }, { "sku": "6316-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6316LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6316LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 80 mm of 6316-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 80 mm bore gains dynamic rating through larger rolling elements on a 170 mm OD; the penalty is mass and a lower limiting speed than the 6216 — do not specify it for speed-critical shafts.", "RSR low-friction seals on 6316-RSR-NTN run faster than contact-seal 6316-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6316-2RS instead.", "The low-drag lip of 6316-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6316-RSR-NTN.", "Never mix components between two 6316-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues this low-friction non-contact seal as 6316LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 80 mm bore 6316 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6316; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 136 kN dynamic load rating (C) and 86.5 kN static (C0), 6.05 kN fatigue load limit Cu, 6316 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3590 g (3.6 kg), 6316 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 136/86.5 kN load ratings, 6.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3590 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6316LLB on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6316 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6316-RSR-NTN bearing?", "a": "A 6316-RSR-NTN deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6316-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN suffix for a sealed 6316?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6316LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×170×39 mm ISO 15 envelope." }, { "q": "Does NTN offer 6316 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6316LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6316-llb", "6316llb", "6316-RSR", "6316-rsr", "6316LLB", "6316-RSR-NTN" ], "locale_variants": {} }, { "sku": "6316-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6316ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6316ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "Do not wash 6316-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6316-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Never mix components between two 6316-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6316ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 80 mm bore 6316 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6316; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 136 kN dynamic load rating (C) and 86.5 kN static (C0), 6.05 kN fatigue load limit Cu, 6316 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3590 g (3.6 kg), 6316 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 136/86.5 kN load ratings, 6.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3590 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6316ZZ on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6316 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6316-ZZ-NTN bearing?", "a": "A 6316-ZZ-NTN deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6316 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6316 uses the same ISO 15 envelope (80×170×39 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6316-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6316-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6316 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6316?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6316ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×170×39 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6316ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6316-zz", "6316zz", "6316-ZZ", "6316ZZ", "6316-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6416-NTN", "brand": "NTN", "manufacturer_designation": "6416", "series": "6400-series", "type": "deep_groove", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 181, "static_load_kN": 125, "fatigue_load_limit_kN": 8.2, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 6760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6416 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 200 mm outside diameter and 48 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 80 mm bore exists for high radial load at moderate rpm; its 200 mm OD and 48 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Storage matters for open bearings: 6416-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6416 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6416-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6416 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 6416 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6416; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 181 kN dynamic load rating (C) and 125 kN static (C0), 8.2 kN fatigue load limit Cu, 6416 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 6760 g (6.8 kg), 6416 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 80×200×48 mm envelope of 6416 gives a D/d ratio of 2.50 and 60.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 181/125 kN load ratings, 8.2 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 6760 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6416 on the 80×200×48 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6416 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6416 is listed." ], "faq": [ { "q": "What are the dimensions of a 6416-NTN bearing?", "a": "A 6416-NTN deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6416-NTN need?", "a": "The open 6416-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6416 bore code work?", "a": "The last two digits of 6416 are bore code 16, giving 16 × 5 = 80 mm bore. The 200 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6416?", "a": "NTN lists the open 6416 under the bare designation 6416; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "Does NTN offer 6416 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6416 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6416-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6416-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6416", "equiv_brand": "SKF", "level": "full", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6416", "6416-NTN" ], "locale_variants": {} }, { "sku": "61817-NTN", "brand": "NTN", "manufacturer_designation": "6817", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.7, "static_load_kN": 19, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61817 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 110 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 85 mm of 61817-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "The open 61817-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 85×110×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61817-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61817-NTN-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 110 mm OD should be round within IT7; an oval bore pinches the outer ring of 61817-NTN and shows up later as two-point loaded raceway wear.", "The open 61817 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 85 mm bore 61817 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61817 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 20.7 kN dynamic load rating (C) and 19 kN static (C0), 1.26 kN fatigue load limit Cu, 61817 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 270 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 20.7/19 kN load ratings, 1.26 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 270 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6817 on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61817 is listed." ], "faq": [ { "q": "What are the dimensions of a 61817-NTN bearing?", "a": "A 61817-NTN deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61817-NTN need?", "a": "The open 61817-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61817?", "a": "NTN lists the open 61817 under the bare designation 6817; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 85 mm bore envelope." }, { "q": "Is 6817 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6817", "61817", "61817-NTN" ], "locale_variants": {} }, { "sku": "61817-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6817LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.7, "static_load_kN": 19, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61817-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 110 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6817LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 85 mm of 61817-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "Contact seals add drag and heat: 61817-2RS-NTN runs slower and cooler-limited than the open 61817; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61817-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61817-2RS-NTN.", "The housing bore for the 110 mm OD should be round within IT7; an oval bore pinches the outer ring of 61817-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6817LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 85 mm bore 61817 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3100 r/min for 61817; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 20.7 kN dynamic load rating (C) and 19 kN static (C0), 1.26 kN fatigue load limit Cu, 61817 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 270 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 20.7/19 kN load ratings, 1.26 kN fatigue load limit Cu NTN lists the grease limiting speed at 3100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 270 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6817LLU on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61817 is listed." ], "faq": [ { "q": "What are the dimensions of a 61817-2RS-NTN bearing?", "a": "A 61817-2RS-NTN deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61817-2RS-NTN need?", "a": "61817-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61817 with a housing grease fitting instead." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61817?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6817LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×110×13 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6817LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-llu", "6817llu", "61817-2RS", "61817-2rs", "6817LLU", "61817-2RS-NTN" ], "locale_variants": {} }, { "sku": "61817-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6817LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.7, "static_load_kN": 19, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61817-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 110 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6817LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 85 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.", "RSR low-friction seals on 61817-RSR-NTN run faster than contact-seal 61817-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61817-2RS instead.", "The low-drag lip of 61817-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61817-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues this low-friction non-contact seal as 6817LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 85 mm bore 61817 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61817 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 20.7 kN dynamic load rating (C) and 19 kN static (C0), 1.26 kN fatigue load limit Cu, 61817 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 270 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 20.7/19 kN load ratings, 1.26 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 270 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6817LLB on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61817-RSR-NTN bearing?", "a": "A 61817-RSR-NTN deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 85 mm bore?", "a": "618 is an extra-thin section: 110×13 mm, only 12.5 mm radial section at 85 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61817 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61817 uses the same ISO 15 envelope (85×110×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61817?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6817LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×110×13 mm ISO 15 envelope." }, { "q": "Is 6817LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-llb", "6817llb", "61817-RSR", "61817-rsr", "6817LLB", "61817-RSR-NTN" ], "locale_variants": {} }, { "sku": "61817-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6817ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.7, "static_load_kN": 19, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6817ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "ZZ shields are non-contact: 61817-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61817-2RS for that.", "Do not wash 61817-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Never mix components between two 61817-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6817ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 85 mm bore 61817 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61817 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 20.7 kN dynamic load rating (C) and 19 kN static (C0), 1.26 kN fatigue load limit Cu, 61817 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 270 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 20.7/19 kN load ratings, 1.26 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 270 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6817ZZ on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61817 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61817-ZZ-NTN bearing?", "a": "A 61817-ZZ-NTN deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61817 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61817 uses the same ISO 15 envelope (85×110×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61817-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61817-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61817 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61817?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6817ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×110×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61817 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6817ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-zz", "6817zz", "61817-ZZ", "6817ZZ", "61817-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61917-NTN", "brand": "NTN", "manufacturer_designation": "6917", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 35.5, "static_load_kN": 29.6, "fatigue_load_limit_kN": 1.99, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 85 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61917-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 85×120×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61917-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61917 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 85 mm bore 61917 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61917 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61917 at 35.5 kN dynamic (C) and 29.6 kN static (C0), 1.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 536 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 35.5/29.6 kN load ratings, 1.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 536 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6917 on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive.", "Standard catalogue stock of 61917 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61917 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61917-NTN bearing?", "a": "A 61917-NTN deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61917 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61917 uses the same ISO 15 envelope (85×120×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61917-NTN have?", "a": "Unless a clearance suffix says otherwise, 61917-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61917 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61917?", "a": "NTN lists the open 61917 under the bare designation 6917; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 85 mm bore envelope." }, { "q": "What cage does NTN fit in 6917?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6917", "61917", "61917-NTN" ], "locale_variants": {} }, { "sku": "61917-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6917LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 35.5, "static_load_kN": 29.6, "fatigue_load_limit_kN": 1.99, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6917LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 85 mm bore the ring mass is significant: heat 61917 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61917-2RS-NTN runs slower and cooler-limited than the open 61917; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61917-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61917-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Never mix components between two 61917-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the contact-sealed version as 6917LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 85 mm bore 61917 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3000 r/min for 61917; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61917 at 35.5 kN dynamic (C) and 29.6 kN static (C0), 1.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 536 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 35.5/29.6 kN load ratings, 1.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 536 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6917LLU on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive.", "Standard catalogue stock of 61917 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61917-2RS-NTN bearing?", "a": "A 61917-2RS-NTN deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61917 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61917 uses the same ISO 15 envelope (85×120×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61917?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6917LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×120×18 mm ISO 15 envelope." }, { "q": "Is 6917LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61917-llu", "6917llu", "61917-2RS", "61917-2rs", "6917LLU", "61917-2RS-NTN" ], "locale_variants": {} }, { "sku": "61917-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6917LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 35.5, "static_load_kN": 29.6, "fatigue_load_limit_kN": 1.99, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6917LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 85 mm of 61917-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61917-RSR-NTN run faster than contact-seal 61917-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61917-2RS instead.", "The non-contact lip of 61917-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 120 mm OD should be round within IT7; an oval bore pinches the outer ring of 61917-RSR-NTN and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61917-RSR-NTN drags the lip and overheats it.", "NTN catalogues this low-friction non-contact seal as 6917LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 85 mm bore 61917 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61917 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61917 at 35.5 kN dynamic (C) and 29.6 kN static (C0), 1.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 536 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 35.5/29.6 kN load ratings, 1.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 536 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6917LLB on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61917 is listed." ], "faq": [ { "q": "What are the dimensions of a 61917-RSR-NTN bearing?", "a": "A 61917-RSR-NTN deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61917 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61917 uses the same ISO 15 envelope (85×120×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61917?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6917LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×120×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6917LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61917-llb", "6917llb", "61917-RSR", "61917-rsr", "6917LLB", "61917-RSR-NTN" ], "locale_variants": {} }, { "sku": "61917-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6917ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 35.5, "static_load_kN": 29.6, "fatigue_load_limit_kN": 1.99, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6917ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Do not wash 61917-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61917-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6917ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 85 mm bore 61917 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61917 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61917 at 35.5 kN dynamic (C) and 29.6 kN static (C0), 1.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 536 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 35.5/29.6 kN load ratings, 1.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 536 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6917ZZ on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive.", "Order the C3 internal-clearance version (61917 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61917 is listed." ], "faq": [ { "q": "What are the dimensions of a 61917-ZZ-NTN bearing?", "a": "A 61917-ZZ-NTN deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61917-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61917?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6917ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×120×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6917ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61917-zz", "6917zz", "61917-ZZ", "6917ZZ", "61917-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16017", "brand": "NTN", "manufacturer_designation": "16017", "series": "16000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.7, "static_load_kN": 26.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 626, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16017 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 17 by five gives the 85 mm bore; the 130 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 85 mm bore shares the 130 mm outside diameter of the 6017 but is only 14 mm wide; a 6017 in a 14 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16017 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×130×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16017 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16017.", "The open 16017 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 85 mm bore 16017 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5000 r/min the grease limiting speed for 16017 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 28.7 kN dynamic load rating (C) and 26.2 kN static (C0), 1.68 kN fatigue load limit Cu, 16017 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 626 g, 16017 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×130×14 mm envelope of 16017 gives a D/d ratio of 1.53 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 28.7/26.2 kN load ratings, 1.68 kN fatigue load limit Cu NTN lists the grease limiting speed at 5000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 626 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16017 on the 85×130×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16017 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16017 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 16017 bearing?", "a": "A 16017 deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 14 mm width (3.346 × 5.118 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 16017 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16017 uses the same ISO 15 envelope (85×130×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 16017 have?", "a": "Unless a clearance suffix says otherwise, 16017 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16017 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 16017?", "a": "NTN lists the open 16017 under the bare designation 16017; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 85 mm bore envelope." }, { "q": "What cage does NTN fit in 16017?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16017" ], "locale_variants": {} }, { "sku": "6217-NTN", "brand": "NTN", "manufacturer_designation": "6217", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 1790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6217 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 150 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6217-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 85×150×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6217 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6217-NTN.", "The open 6217 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 85 mm bore 6217 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4200 r/min for 6217; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 92 kN dynamic load rating (C) and 64 kN static (C0), 4.6 kN fatigue load limit Cu, 6217 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1790 g (1.8 kg), 6217 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 92/64 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1790 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6217 on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive.", "Standard catalogue stock of 6217 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6217-NTN bearing?", "a": "A 6217-NTN deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "Are 6217 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6217 uses the same ISO 15 envelope (85×150×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6217?", "a": "NTN lists the open 6217 under the bare designation 6217; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 85 mm bore envelope." }, { "q": "Is 6217 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6217", "6217-NTN" ], "locale_variants": {} }, { "sku": "6217-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6217LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 1790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6217LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 85 mm bore the ring mass is significant: heat 6217 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6217-2RS-NTN runs slower and cooler-limited than the open 6217; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6217-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6217LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 85 mm bore 6217 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2800 r/min for 6217; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 92 kN dynamic load rating (C) and 64 kN static (C0), 4.6 kN fatigue load limit Cu, 6217 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1790 g (1.8 kg), 6217 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 92/64 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1790 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6217LLU on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive.", "Standard catalogue stock of 6217 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6217 is listed." ], "faq": [ { "q": "What are the dimensions of a 6217-2RS-NTN bearing?", "a": "A 6217-2RS-NTN deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6217-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6217?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6217LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×150×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6217LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6217-llu", "6217llu", "6217-2RS", "6217-2rs", "6217LLU", "6217-2RS-NTN" ], "locale_variants": {} }, { "sku": "6217-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6217LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 1790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6217-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 150 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6217LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 85 mm of 6217-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The low-drag lip of 6217-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6217-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Never mix components between two 6217-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues this low-friction non-contact seal as 6217LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 85 mm bore 6217 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4200 r/min for 6217; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 92 kN dynamic load rating (C) and 64 kN static (C0), 4.6 kN fatigue load limit Cu, 6217 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1790 g (1.8 kg), 6217 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 92/64 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1790 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6217LLB on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive.", "Order the C3 internal-clearance version (6217 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6217 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6217-RSR-NTN bearing?", "a": "A 6217-RSR-NTN deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6217-RSR-NTN need?", "a": "6217-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6217 with a housing grease fitting instead." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6217?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6217LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×150×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6217LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6217-llb", "6217llb", "6217-RSR", "6217-rsr", "6217LLB", "6217-RSR-NTN" ], "locale_variants": {} }, { "sku": "6217-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6217ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 1790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6217-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 150 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6217ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 85 mm of 6217-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6217-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6217-2RS for that.", "Shielded 6217-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6217-ZZ-NTN and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6217ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 85 mm bore 6217 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4200 r/min for 6217; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 92 kN dynamic load rating (C) and 64 kN static (C0), 4.6 kN fatigue load limit Cu, 6217 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1790 g (1.8 kg), 6217 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 92/64 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1790 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6217ZZ on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6217 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6217-ZZ-NTN bearing?", "a": "A 6217-ZZ-NTN deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6217-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 6217?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6217ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×150×28 mm ISO 15 envelope." }, { "q": "Does NTN offer 6217 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6217ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6217-zz", "6217zz", "6217-ZZ", "6217ZZ", "6217-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6317-NTN", "brand": "NTN", "manufacturer_designation": "6317", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 4230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6317 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 180 mm outside diameter and 41 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 85 mm of 6317-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 85 mm bore gains dynamic rating through larger rolling elements on a 180 mm OD; the penalty is mass and a lower limiting speed than the 6217 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6317-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6317 units.", "Never mix components between two 6317-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 85 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6317-NTN.", "The open 6317 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 85 mm bore 6317 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 6317; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 97 kN static (C0), 6.55 kN fatigue load limit Cu, 6317 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4230 g (4.2 kg), 6317 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 147/97 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6317 on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6317-NTN bearing?", "a": "A 6317-NTN deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6317 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6317 uses the same ISO 15 envelope (85×180×41 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6317?", "a": "NTN lists the open 6317 under the bare designation 6317; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 85 mm bore envelope." }, { "q": "Does NTN offer 6317 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6317 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6317", "6317-NTN" ], "locale_variants": {} }, { "sku": "6317-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6317LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 4230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6317LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 85 mm bore the ring mass is significant: heat 6317 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "Contact seals add drag and heat: 6317-2RS-NTN runs slower and cooler-limited than the open 6317; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6317-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6317LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 85 mm bore 6317 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2600 r/min for 6317; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 97 kN static (C0), 6.55 kN fatigue load limit Cu, 6317 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4230 g (4.2 kg), 6317 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 147/97 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6317LLU on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive.", "Order the C3 internal-clearance version (6317 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6317-2RS-NTN bearing?", "a": "A 6317-2RS-NTN deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6317 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6317 uses the same ISO 15 envelope (85×180×41 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6317?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6317LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×180×41 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6317LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6317-llu", "6317llu", "6317-2RS", "6317-2rs", "6317LLU", "6317-2RS-NTN" ], "locale_variants": {} }, { "sku": "6317-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6317LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 4230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6317-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 180 mm outside diameter and 41 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6317LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 85 mm bore the ring mass is significant: heat 6317 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "The low-drag lip of 6317-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6317-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 6317-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues this low-friction non-contact seal as 6317LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 85 mm bore 6317 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 6317; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 97 kN static (C0), 6.55 kN fatigue load limit Cu, 6317 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4230 g (4.2 kg), 6317 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 147/97 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6317LLB on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive.", "Order the C3 internal-clearance version (6317 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6317 is listed." ], "faq": [ { "q": "What are the dimensions of a 6317-RSR-NTN bearing?", "a": "A 6317-RSR-NTN deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6317-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6317-RSR-NTN need?", "a": "6317-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6317 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6317?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6317LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×180×41 mm ISO 15 envelope." }, { "q": "Is 6317LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6317-llb", "6317llb", "6317-RSR", "6317-rsr", "6317LLB", "6317-RSR-NTN" ], "locale_variants": {} }, { "sku": "6317-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6317ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 4230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6317ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "ZZ shields are non-contact: 6317-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6317-2RS for that.", "Do not wash 6317-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 41 mm-wide ring of 6317-ZZ-NTN drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 85 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6317-ZZ-NTN.", "NTN catalogues the shielded version as 6317ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 85 mm bore 6317 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 6317; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 97 kN static (C0), 6.55 kN fatigue load limit Cu, 6317 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4230 g (4.2 kg), 6317 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 147/97 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6317ZZ on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (6317 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6317-ZZ-NTN bearing?", "a": "A 6317-ZZ-NTN deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6317-ZZ-NTN need?", "a": "6317-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6317?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6317ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×180×41 mm ISO 15 envelope." }, { "q": "Does NTN offer 6317 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6317ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6317-zz", "6317zz", "6317-ZZ", "6317ZZ", "6317-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61818-NTN", "brand": "NTN", "manufacturer_designation": "6818", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.1, "static_load_kN": 19.7, "fatigue_load_limit_kN": 1.3, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 285, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61818 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 115 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 90 mm of 61818-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 90 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6218.", "The open 61818-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 90×115×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61818 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61818-NTN-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 115 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61818-NTN.", "The open 61818 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 90 mm bore 61818 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61818 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.1 kN dynamic load rating (C) and 19.7 kN static (C0), 1.3 kN fatigue load limit Cu, 61818 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 285 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.1/19.7 kN load ratings, 1.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 285 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6818 on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61818-NTN bearing?", "a": "A 61818-NTN deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61818 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61818 uses the same ISO 15 envelope (90×115×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61818?", "a": "NTN lists the open 61818 under the bare designation 6818; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 90 mm bore envelope." }, { "q": "What cage does NTN fit in 6818?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6818", "61818", "61818-NTN" ], "locale_variants": {} }, { "sku": "61818-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6818LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.1, "static_load_kN": 19.7, "fatigue_load_limit_kN": 1.3, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 285, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6818LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 90 mm of 61818-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 90 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6218.", "Contact seals add drag and heat: 61818-2RS-NTN runs slower and cooler-limited than the open 61818; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61818-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61818-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6818LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 90 mm bore 61818 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3000 r/min for 61818; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.1 kN dynamic load rating (C) and 19.7 kN static (C0), 1.3 kN fatigue load limit Cu, 61818 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 285 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.1/19.7 kN load ratings, 1.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 285 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6818LLU on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive.", "Order the C3 internal-clearance version (61818 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61818-2RS-NTN bearing?", "a": "A 61818-2RS-NTN deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61818-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61818-2RS-NTN need?", "a": "61818-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61818 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61818?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6818LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×115×13 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6818LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-llu", "6818llu", "61818-2RS", "61818-2rs", "6818LLU", "61818-2RS-NTN" ], "locale_variants": {} }, { "sku": "61818-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6818LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.1, "static_load_kN": 19.7, "fatigue_load_limit_kN": 1.3, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 285, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61818-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 115 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6818LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 90 mm of 61818-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 90 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6218.", "RSR low-friction seals on 61818-RSR-NTN run faster than contact-seal 61818-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61818-2RS instead.", "The non-contact lip of 61818-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61818-RSR-NTN drags the lip and overheats it.", "NTN catalogues this low-friction non-contact seal as 6818LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 90 mm bore 61818 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61818 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.1 kN dynamic load rating (C) and 19.7 kN static (C0), 1.3 kN fatigue load limit Cu, 61818 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 285 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.1/19.7 kN load ratings, 1.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 285 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6818LLB on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive.", "Order the C3 internal-clearance version (61818 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 61818 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61818-RSR-NTN bearing?", "a": "A 61818-RSR-NTN deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 61818-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61818-RSR-NTN need?", "a": "61818-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61818 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61818?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6818LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×115×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61818 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6818LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-llb", "6818llb", "61818-RSR", "61818-rsr", "6818LLB", "61818-RSR-NTN" ], "locale_variants": {} }, { "sku": "61818-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6818ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.1, "static_load_kN": 19.7, "fatigue_load_limit_kN": 1.3, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 285, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61818-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 115 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6818ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 90 mm of 61818-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "ZZ shields are non-contact: 61818-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61818-2RS for that.", "Do not wash 61818-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 61818-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 115 mm OD should be round within IT7; an oval bore pinches the outer ring of 61818-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6818ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 90 mm bore 61818 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61818 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.1 kN dynamic load rating (C) and 19.7 kN static (C0), 1.3 kN fatigue load limit Cu, 61818 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 285 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.1/19.7 kN load ratings, 1.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 285 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6818ZZ on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive.", "Standard catalogue stock of 61818 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61818-ZZ-NTN bearing?", "a": "A 61818-ZZ-NTN deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61818-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61818-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61818 and verify the residual clearance after mounting." }, { "q": "How should 61818-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61818?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6818ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×115×13 mm ISO 15 envelope." }, { "q": "Is 6818ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-zz", "6818zz", "61818-ZZ", "6818ZZ", "61818-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61918-NTN", "brand": "NTN", "manufacturer_designation": "6918", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36.5, "static_load_kN": 31.5, "fatigue_load_limit_kN": 2.05, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 554, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 90 mm of 61918-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61918-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 90×125×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61918-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61918 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 90 mm bore 61918 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 61918 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61918 at 36.5 kN dynamic (C) and 31.5 kN static (C0), 2.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 554 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 36.5/31.5 kN load ratings, 2.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 554 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6918 on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive.", "Standard catalogue stock of 61918 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61918-NTN bearing?", "a": "A 61918-NTN deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61918 mean?", "a": "A bare 61918 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 90 mm bore?", "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN order number for an open 61918?", "a": "NTN lists the open 61918 under the bare designation 6918; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 90 mm bore envelope." }, { "q": "Is 6918 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "full", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6918", "61918", "61918-NTN" ], "locale_variants": {} }, { "sku": "61918-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6918LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36.5, "static_load_kN": 31.5, "fatigue_load_limit_kN": 2.05, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 554, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6918LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 90 mm of 61918-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 90 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61918-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61918-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6918LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 90 mm bore 61918 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 61918; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61918 at 36.5 kN dynamic (C) and 31.5 kN static (C0), 2.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 554 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 36.5/31.5 kN load ratings, 2.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 554 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6918LLU on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61918 is listed.", "Order the C3 internal-clearance version (61918 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61918-2RS-NTN bearing?", "a": "A 61918-2RS-NTN deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61918-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61918-2RS-NTN need?", "a": "61918-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61918 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61918?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6918LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×125×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 61918 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6918LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61918-llu", "6918llu", "61918-2RS", "61918-2rs", "6918LLU", "61918-2RS-NTN" ], "locale_variants": {} }, { "sku": "61918-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6918LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36.5, "static_load_kN": 31.5, "fatigue_load_limit_kN": 2.05, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 554, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6918LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The low-drag lip of 61918-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61918-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues this low-friction non-contact seal as 6918LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 90 mm bore 61918 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 61918 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61918 at 36.5 kN dynamic (C) and 31.5 kN static (C0), 2.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 554 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 36.5/31.5 kN load ratings, 2.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 554 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6918LLB on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 61918 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61918-RSR-NTN bearing?", "a": "A 61918-RSR-NTN deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61918-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 61918?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6918LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×125×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 61918 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6918LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61918-llb", "6918llb", "61918-RSR", "61918-rsr", "6918LLB", "61918-RSR-NTN" ], "locale_variants": {} }, { "sku": "61918-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6918ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36.5, "static_load_kN": 31.5, "fatigue_load_limit_kN": 2.05, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 554, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61918-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 125 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6918ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Do not wash 61918-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61918-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61918-ZZ-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61918-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6918ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 90 mm bore 61918 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 61918 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61918 at 36.5 kN dynamic (C) and 31.5 kN static (C0), 2.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 554 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 36.5/31.5 kN load ratings, 2.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 554 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6918ZZ on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61918-ZZ-NTN bearing?", "a": "A 61918-ZZ-NTN deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61918-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 61918?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6918ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×125×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 61918 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6918ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61918-zz", "6918zz", "61918-ZZ", "6918ZZ", "61918-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16018", "brand": "NTN", "manufacturer_designation": "16018", "series": "16000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.07, "limiting_speed_rpm": 4700, "max_rpm": 4700, "weight_g": 848, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16018 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 18 by five gives the 90 mm bore; the 140 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 90 mm of 16018 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 160xx narrow section at 90 mm bore shares the 140 mm outside diameter of the 6018 but is only 16 mm wide; a 6018 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16018 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×140×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16018 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Never mix components between two 16018 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 16018 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 90 mm bore 16018 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4700 r/min for 16018; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16018 at 37 kN dynamic (C) and 33.5 kN static (C0), 2.07 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 848 g, 16018 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×140×16 mm envelope of 16018 gives a D/d ratio of 1.56 and 25.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 37/33.5 kN load ratings, 2.07 kN fatigue load limit Cu NTN lists the grease limiting speed at 4700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 848 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16018 on the 90×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16018 in a rated drive.", "Order the C3 internal-clearance version (16018 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16018 is listed." ], "faq": [ { "q": "What are the dimensions of a 16018 bearing?", "a": "A 16018 deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 16 mm width (3.543 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16018 bore code work?", "a": "The last two digits of 16018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16018 mean?", "a": "A bare 16018 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 16018?", "a": "NTN lists the open 16018 under the bare designation 16018; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 90 mm bore envelope." }, { "q": "What cage does NTN fit in 16018?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16018" ], "locale_variants": {} }, { "sku": "6218-NTN", "brand": "NTN", "manufacturer_designation": "6218", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6218 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 160 mm outside diameter and 30 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6218 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "The open 6218-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 90×160×30 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6218 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 30 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6218 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 90 mm bore 6218 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6218; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 5 kN fatigue load limit Cu, 6218 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2150 g (2.1 kg), 6218 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 106/71.5 kN load ratings, 5 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6218 on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6218-NTN bearing?", "a": "A 6218-NTN deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6218-NTN have?", "a": "Unless a clearance suffix says otherwise, 6218-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6218 and verify the residual clearance after mounting." }, { "q": "How should 6218-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6218?", "a": "NTN lists the open 6218 under the bare designation 6218; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 90 mm bore envelope." }, { "q": "Does NTN offer 6218 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6218 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6218", "6218-NTN" ], "locale_variants": {} }, { "sku": "6218-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6218LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6218LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6218 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Heat is the enemy of the sealed 6218-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6218-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 160 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6218-2RS-NTN.", "Shaft and housing fillets must clear the bearing chamfer so the 30 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6218LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 90 mm bore 6218 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2600 r/min for 6218; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 5 kN fatigue load limit Cu, 6218 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2150 g (2.1 kg), 6218 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 106/71.5 kN load ratings, 5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6218LLU on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6218 is listed.", "Order the C3 internal-clearance version (6218 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6218-2RS-NTN bearing?", "a": "A 6218-2RS-NTN deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6218-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6218-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6218 and verify the residual clearance after mounting." }, { "q": "How should 6218-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6218?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6218LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×160×30 mm ISO 15 envelope." }, { "q": "Is 6218LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6218-llu", "6218llu", "6218-2RS", "6218-2rs", "6218LLU", "6218-2RS-NTN" ], "locale_variants": {} }, { "sku": "6218-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6218LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6218-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 160 mm outside diameter and 30 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6218LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 90 mm of 6218-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The low-drag lip of 6218-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6218-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6218-RSR-NTN.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues this low-friction non-contact seal as 6218LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 90 mm bore 6218 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6218; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 5 kN fatigue load limit Cu, 6218 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2150 g (2.1 kg), 6218 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 106/71.5 kN load ratings, 5 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6218LLB on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6218 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6218-RSR-NTN bearing?", "a": "A 6218-RSR-NTN deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6218-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6218?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6218LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×160×30 mm ISO 15 envelope." }, { "q": "Does NTN offer 6218 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6218LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6218-llb", "6218llb", "6218-RSR", "6218-rsr", "6218LLB", "6218-RSR-NTN" ], "locale_variants": {} }, { "sku": "6218-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6218ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6218ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 90 mm of 6218-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "Do not wash 6218-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6218-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6218-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "Never mix components between two 6218-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6218ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 90 mm bore 6218 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6218; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 5 kN fatigue load limit Cu, 6218 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2150 g (2.1 kg), 6218 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 106/71.5 kN load ratings, 5 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6218ZZ on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive.", "Order the C3 internal-clearance version (6218 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6218-ZZ-NTN bearing?", "a": "A 6218-ZZ-NTN deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6218-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6218-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6218 and verify the residual clearance after mounting." }, { "q": "How should 6218-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6218?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6218ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×160×30 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6218ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6218-zz", "6218zz", "6218-ZZ", "6218ZZ", "6218-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6318-NTN", "brand": "NTN", "manufacturer_designation": "6318", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 4910, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6318 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 190 mm outside diameter and 43 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6318 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 90 mm bore gains dynamic rating through larger rolling elements on a 190 mm OD; the penalty is mass and a lower limiting speed than the 6218 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6318-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6318 units.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6318-NTN.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6318 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 90 mm bore 6318 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6318; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 107 kN static (C0), 7.1 kN fatigue load limit Cu, 6318 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4910 g (4.9 kg), 6318 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 158/107 kN load ratings, 7.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6318 on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6318-NTN bearing?", "a": "A 6318-NTN deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6318-NTN have?", "a": "Unless a clearance suffix says otherwise, 6318-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6318 and verify the residual clearance after mounting." }, { "q": "How should 6318-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6318?", "a": "NTN lists the open 6318 under the bare designation 6318; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 90 mm bore envelope." }, { "q": "Is 6318 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6318", "6318-NTN" ], "locale_variants": {} }, { "sku": "6318-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6318LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 4910, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6318-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 190 mm outside diameter and 43 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6318LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "Contact seals add drag and heat: 6318-2RS-NTN runs slower and cooler-limited than the open 6318; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6318-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 90 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6318LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 90 mm bore 6318 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2400 r/min for 6318; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 107 kN static (C0), 7.1 kN fatigue load limit Cu, 6318 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4910 g (4.9 kg), 6318 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 158/107 kN load ratings, 7.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6318LLU on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive.", "Order the C3 internal-clearance version (6318 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6318-2RS-NTN bearing?", "a": "A 6318-2RS-NTN deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6318-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6318-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6318 and verify the residual clearance after mounting." }, { "q": "How should 6318-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6318?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6318LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×190×43 mm ISO 15 envelope." }, { "q": "Does NTN offer 6318 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6318LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6318-llu", "6318llu", "6318-2RS", "6318-2rs", "6318LLU", "6318-2RS-NTN" ], "locale_variants": {} }, { "sku": "6318-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6318LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 4910, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6318LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "RSR low-friction seals on 6318-RSR-NTN run faster than contact-seal 6318-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6318-2RS instead.", "The low-drag lip of 6318-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6318-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6318LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 90 mm bore 6318 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6318; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 107 kN static (C0), 7.1 kN fatigue load limit Cu, 6318 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4910 g (4.9 kg), 6318 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 158/107 kN load ratings, 7.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6318LLB on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (6318 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6318-RSR-NTN bearing?", "a": "A 6318-RSR-NTN deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6318-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6318-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6318 and verify the residual clearance after mounting." }, { "q": "How should 6318-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6318?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6318LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×190×43 mm ISO 15 envelope." }, { "q": "Does NTN offer 6318 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6318LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6318-llb", "6318llb", "6318-RSR", "6318-rsr", "6318LLB", "6318-RSR-NTN" ], "locale_variants": {} }, { "sku": "6318-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6318ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 4910, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6318-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 190 mm outside diameter and 43 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6318ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 90 mm of 6318-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 90 mm bore gains dynamic rating through larger rolling elements on a 190 mm OD; the penalty is mass and a lower limiting speed than the 6218 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6318-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6318-2RS for that.", "Do not wash 6318-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Vibration during standstill brinells the raceways of a 90 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6318ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 90 mm bore 6318 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6318; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 107 kN static (C0), 7.1 kN fatigue load limit Cu, 6318 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4910 g (4.9 kg), 6318 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 158/107 kN load ratings, 7.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6318ZZ on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6318 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6318-ZZ-NTN bearing?", "a": "A 6318-ZZ-NTN deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6318-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 6318?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6318ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×190×43 mm ISO 15 envelope." }, { "q": "Is 6318ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6318-zz", "6318zz", "6318-ZZ", "6318ZZ", "6318-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61819-NTN", "brand": "NTN", "manufacturer_designation": "6819", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.4, "static_load_kN": 20.5, "fatigue_load_limit_kN": 1.31, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61819 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 120 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 95 mm of 61819-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.", "The open 61819-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 95×120×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61819 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61819 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 95 mm bore 61819 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5000 r/min the grease limiting speed for 61819 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.4 kN dynamic load rating (C) and 20.5 kN static (C0), 1.31 kN fatigue load limit Cu, 61819 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 300 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.4/20.5 kN load ratings, 1.31 kN fatigue load limit Cu NTN lists the grease limiting speed at 5000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6819 on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61819 is listed." ], "faq": [ { "q": "What are the dimensions of a 61819-NTN bearing?", "a": "A 61819-NTN deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61819 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61819 uses the same ISO 15 envelope (95×120×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61819-NTN have?", "a": "Unless a clearance suffix says otherwise, 61819-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61819 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61819?", "a": "NTN lists the open 61819 under the bare designation 6819; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 95 mm bore envelope." }, { "q": "What cage does NTN fit in 6819?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6819", "61819", "61819-NTN" ], "locale_variants": {} }, { "sku": "61819-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6819LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.4, "static_load_kN": 20.5, "fatigue_load_limit_kN": 1.31, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6819LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 95 mm of 61819-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.", "Contact seals add drag and heat: 61819-2RS-NTN runs slower and cooler-limited than the open 61819; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61819-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61819-2RS-NTN.", "NTN catalogues the contact-sealed version as 6819LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 95 mm bore 61819 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2800 r/min for 61819; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.4 kN dynamic load rating (C) and 20.5 kN static (C0), 1.31 kN fatigue load limit Cu, 61819 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 300 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.4/20.5 kN load ratings, 1.31 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6819LLU on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61819 is listed.", "Standard catalogue stock of 61819 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61819-2RS-NTN bearing?", "a": "A 61819-2RS-NTN deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61819-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61819-2RS-NTN need?", "a": "61819-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61819 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61819?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6819LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×120×13 mm ISO 15 envelope." }, { "q": "Is 6819LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61819-llu", "6819llu", "61819-2RS", "61819-2rs", "6819LLU", "61819-2RS-NTN" ], "locale_variants": {} }, { "sku": "61819-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6819LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.4, "static_load_kN": 20.5, "fatigue_load_limit_kN": 1.31, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61819-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 120 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6819LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.", "The low-drag lip of 61819-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61819-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Never mix components between two 61819-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues this low-friction non-contact seal as 6819LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 95 mm bore 61819 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5000 r/min the grease limiting speed for 61819 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.4 kN dynamic load rating (C) and 20.5 kN static (C0), 1.31 kN fatigue load limit Cu, 61819 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 300 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.4/20.5 kN load ratings, 1.31 kN fatigue load limit Cu NTN lists the grease limiting speed at 5000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6819LLB on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61819-RSR-NTN bearing?", "a": "A 61819-RSR-NTN deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61819-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 61819-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61819 and verify the residual clearance after mounting." }, { "q": "How should 61819-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61819?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6819LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×120×13 mm ISO 15 envelope." }, { "q": "Is 6819LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61819-llb", "6819llb", "61819-RSR", "61819-rsr", "6819LLB", "61819-RSR-NTN" ], "locale_variants": {} }, { "sku": "61819-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6819ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.4, "static_load_kN": 20.5, "fatigue_load_limit_kN": 1.31, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61819-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 120 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6819ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 95 mm of 61819-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.", "Do not wash 61819-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61819-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61819-ZZ-NTN.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6819ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 95 mm bore 61819 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5000 r/min the grease limiting speed for 61819 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.4 kN dynamic load rating (C) and 20.5 kN static (C0), 1.31 kN fatigue load limit Cu, 61819 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 300 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.4/20.5 kN load ratings, 1.31 kN fatigue load limit Cu NTN lists the grease limiting speed at 5000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6819ZZ on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61819-ZZ-NTN bearing?", "a": "A 61819-ZZ-NTN deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61819-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61819?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6819ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×120×13 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6819ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61819-zz", "6819zz", "61819-ZZ", "6819ZZ", "61819-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61919-NTN", "brand": "NTN", "manufacturer_designation": "6919", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 579, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61919 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 130 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 95 mm of 61919-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61919-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 95×130×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61919-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61919-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61919 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 95 mm bore 61919 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61919; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61919 at 37.5 kN dynamic (C) and 33.5 kN static (C0), 2.1 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 579 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 37.5/33.5 kN load ratings, 2.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 579 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6919 on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61919-NTN bearing?", "a": "A 61919-NTN deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61919-NTN have?", "a": "Unless a clearance suffix says otherwise, 61919-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61919 and verify the residual clearance after mounting." }, { "q": "How should 61919-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61919?", "a": "NTN lists the open 61919 under the bare designation 6919; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 95 mm bore envelope." }, { "q": "Does NTN offer 61919 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6919 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6919", "61919", "61919-NTN" ], "locale_variants": {} }, { "sku": "61919-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6919LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 579, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61919-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 130 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6919LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61919-2RS-NTN runs slower and cooler-limited than the open 61919; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61919-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6919LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 95 mm bore 61919 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2800 r/min for 61919; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61919 at 37.5 kN dynamic (C) and 33.5 kN static (C0), 2.1 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 579 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 37.5/33.5 kN load ratings, 2.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 579 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6919LLU on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61919 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61919-2RS-NTN bearing?", "a": "A 61919-2RS-NTN deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61919-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61919?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6919LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×130×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6919LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61919-llu", "6919llu", "61919-2RS", "61919-2rs", "6919LLU", "61919-2RS-NTN" ], "locale_variants": {} }, { "sku": "61919-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6919LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 579, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6919LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 61919 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61919-RSR-NTN run faster than contact-seal 61919-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61919-2RS instead.", "The non-contact lip of 61919-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues this low-friction non-contact seal as 6919LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 95 mm bore 61919 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61919; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61919 at 37.5 kN dynamic (C) and 33.5 kN static (C0), 2.1 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 579 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 37.5/33.5 kN load ratings, 2.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 579 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6919LLB on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 61919 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61919-RSR-NTN bearing?", "a": "A 61919-RSR-NTN deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61919-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 61919?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6919LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×130×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 61919 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6919LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61919-llb", "6919llb", "61919-RSR", "61919-rsr", "6919LLB", "61919-RSR-NTN" ], "locale_variants": {} }, { "sku": "61919-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6919ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 579, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6919ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 61919 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 95 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61919-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61919-2RS for that.", "Do not wash 61919-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 61919-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6919ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 95 mm bore 61919 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61919; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61919 at 37.5 kN dynamic (C) and 33.5 kN static (C0), 2.1 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 579 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 37.5/33.5 kN load ratings, 2.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 579 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6919ZZ on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive.", "Order the C3 internal-clearance version (61919 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 61919 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61919-ZZ-NTN bearing?", "a": "A 61919-ZZ-NTN deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61919-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61919?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6919ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×130×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6919ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61919-zz", "6919zz", "61919-ZZ", "6919ZZ", "61919-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16019", "brand": "NTN", "manufacturer_designation": "16019", "series": "16000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 38, "static_load_kN": 35, "fatigue_load_limit_kN": 2.13, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 885, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16019 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 19 by five gives the 95 mm bore; the 145 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 95 mm bore shares the 145 mm outside diameter of the 6019 but is only 16 mm wide; a 6019 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "Storage matters for open bearings: 16019 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16019 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16019-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 16019 drags the lip and overheats it.", "The open 16019 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 95 mm bore 16019 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 16019; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16019 at 38 kN dynamic (C) and 35 kN static (C0), 2.13 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 885 g, 16019 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×145×16 mm envelope of 16019 gives a D/d ratio of 1.53 and 25.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 38/35 kN load ratings, 2.13 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 885 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16019 on the 95×145×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16019 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 16019 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16019 bearing?", "a": "A 16019 deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 16 mm width (3.74 × 5.709 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 16019 need?", "a": "The open 16019 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 16019 bore code work?", "a": "The last two digits of 16019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 16019?", "a": "NTN lists the open 16019 under the bare designation 16019; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 95 mm bore envelope." }, { "q": "Does NTN offer 16019 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16019 is the correct choice." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16019" ], "locale_variants": {} }, { "sku": "6219-NTN", "brand": "NTN", "manufacturer_designation": "6219", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 121, "static_load_kN": 82, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 2620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 95 mm of 6219-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6219-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 95×170×32 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6219-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6219-NTN-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6219-NTN.", "The open 6219 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 95 mm bore 6219 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3700 r/min for 6219; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 121 kN dynamic load rating (C) and 82 kN static (C0), 5.55 kN fatigue load limit Cu, 6219 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2620 g (2.6 kg), 6219 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 121/82 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6219 on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive.", "Order the C3 internal-clearance version (6219 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6219 is listed." ], "faq": [ { "q": "What are the dimensions of a 6219-NTN bearing?", "a": "A 6219-NTN deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6219 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6219 uses the same ISO 15 envelope (95×170×32 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6219-NTN have?", "a": "Unless a clearance suffix says otherwise, 6219-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6219 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6219?", "a": "NTN lists the open 6219 under the bare designation 6219; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 95 mm bore envelope." }, { "q": "What cage does NTN fit in 6219?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6219", "6219-NTN" ], "locale_variants": {} }, { "sku": "6219-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6219LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 121, "static_load_kN": 82, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 2620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6219-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6219LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 95 mm of 6219-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6219-2RS-NTN runs slower and cooler-limited than the open 6219; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6219-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 32 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 32 mm-wide ring of 6219-2RS-NTN drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6219LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 95 mm bore 6219 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2500 r/min for 6219; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 121 kN dynamic load rating (C) and 82 kN static (C0), 5.55 kN fatigue load limit Cu, 6219 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2620 g (2.6 kg), 6219 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 121/82 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6219LLU on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6219-2RS-NTN bearing?", "a": "A 6219-2RS-NTN deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6219-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6219?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6219LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×170×32 mm ISO 15 envelope." }, { "q": "Is 6219LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6219-llu", "6219llu", "6219-2RS", "6219-2rs", "6219LLU", "6219-2RS-NTN" ], "locale_variants": {} }, { "sku": "6219-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6219LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 121, "static_load_kN": 82, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 2620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6219LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6219-RSR-NTN run faster than contact-seal 6219-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6219-2RS instead.", "The low-drag lip of 6219-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6219-RSR-NTN.", "Shaft and housing fillets must clear the bearing chamfer so the 32 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues this low-friction non-contact seal as 6219LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 95 mm bore 6219 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3700 r/min for 6219; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 121 kN dynamic load rating (C) and 82 kN static (C0), 5.55 kN fatigue load limit Cu, 6219 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2620 g (2.6 kg), 6219 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 121/82 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6219LLB on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive.", "Standard catalogue stock of 6219 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6219 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6219-RSR-NTN bearing?", "a": "A 6219-RSR-NTN deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6219 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6219 uses the same ISO 15 envelope (95×170×32 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6219-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6219-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6219 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6219?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6219LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×170×32 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6219LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6219-llb", "6219llb", "6219-RSR", "6219-rsr", "6219LLB", "6219-RSR-NTN" ], "locale_variants": {} }, { "sku": "6219-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6219ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 121, "static_load_kN": 82, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 2620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6219-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6219ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6219-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6219-2RS for that.", "Shielded 6219-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 170 mm OD should be round within IT7; an oval bore pinches the outer ring of 6219-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6219ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 95 mm bore 6219 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3700 r/min for 6219; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 121 kN dynamic load rating (C) and 82 kN static (C0), 5.55 kN fatigue load limit Cu, 6219 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2620 g (2.6 kg), 6219 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 121/82 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6219ZZ on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive.", "Order the C3 internal-clearance version (6219 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6219 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6219-ZZ-NTN bearing?", "a": "A 6219-ZZ-NTN deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6219 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6219 uses the same ISO 15 envelope (95×170×32 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6219-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6219-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6219 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6219?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6219ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×170×32 mm ISO 15 envelope." }, { "q": "Does NTN offer 6219 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6219ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6219-zz", "6219zz", "6219-ZZ", "6219ZZ", "6219-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6319-NTN", "brand": "NTN", "manufacturer_designation": "6319", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "limiting_speed_rpm": 3300, "max_rpm": 3300, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6319 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 6319 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "The open 6319-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 95×200×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6319-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6319-NTN drags the lip and overheats it.", "The open 6319 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 95 mm bore 6319 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3300 r/min for 6319; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 169 kN dynamic load rating (C) and 119 kN static (C0), 7.65 kN fatigue load limit Cu, 6319 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5670 g (5.7 kg), 6319 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 169/119 kN load ratings, 7.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5670 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6319 on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6319 is listed." ], "faq": [ { "q": "What are the dimensions of a 6319-NTN bearing?", "a": "A 6319-NTN deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6319-NTN need?", "a": "The open 6319-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6319?", "a": "NTN lists the open 6319 under the bare designation 6319; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 95 mm bore envelope." }, { "q": "Is 6319 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6319", "6319-NTN" ], "locale_variants": {} }, { "sku": "6319-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6319LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6319LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 95 mm of 6319-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 95 mm bore gains dynamic rating through larger rolling elements on a 200 mm OD; the penalty is mass and a lower limiting speed than the 6219 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6319-2RS-NTN runs slower and cooler-limited than the open 6319; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6319-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6319-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6319LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 95 mm bore 6319 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2300 r/min for 6319; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 169 kN dynamic load rating (C) and 119 kN static (C0), 7.65 kN fatigue load limit Cu, 6319 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5670 g (5.7 kg), 6319 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 169/119 kN load ratings, 7.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5670 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6319LLU on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6319-2RS-NTN bearing?", "a": "A 6319-2RS-NTN deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6319-2RS-NTN need?", "a": "6319-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6319 with a housing grease fitting instead." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6319?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6319LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×200×45 mm ISO 15 envelope." }, { "q": "Is 6319LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6319-llu", "6319llu", "6319-2RS", "6319-2rs", "6319LLU", "6319-2RS-NTN" ], "locale_variants": {} }, { "sku": "6319-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6319LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "limiting_speed_rpm": 3300, "max_rpm": 3300, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6319LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 95 mm of 6319-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "RSR low-friction seals on 6319-RSR-NTN run faster than contact-seal 6319-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6319-2RS instead.", "The low-drag lip of 6319-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6319-RSR-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6319-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues this low-friction non-contact seal as 6319LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 95 mm bore 6319 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3300 r/min for 6319; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 169 kN dynamic load rating (C) and 119 kN static (C0), 7.65 kN fatigue load limit Cu, 6319 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5670 g (5.7 kg), 6319 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 169/119 kN load ratings, 7.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5670 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6319LLB on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6319 is listed." ], "faq": [ { "q": "What are the dimensions of a 6319-RSR-NTN bearing?", "a": "A 6319-RSR-NTN deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6319-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 6319?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6319LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×200×45 mm ISO 15 envelope." }, { "q": "Is 6319LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6319-llb", "6319llb", "6319-RSR", "6319-rsr", "6319LLB", "6319-RSR-NTN" ], "locale_variants": {} }, { "sku": "6319-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6319ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "limiting_speed_rpm": 3300, "max_rpm": 3300, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6319-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6319ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "Do not wash 6319-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6319-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6319-ZZ-NTN drags the lip and overheats it.", "Never mix components between two 6319-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6319ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 95 mm bore 6319 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3300 r/min for 6319; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 169 kN dynamic load rating (C) and 119 kN static (C0), 7.65 kN fatigue load limit Cu, 6319 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5670 g (5.7 kg), 6319 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 169/119 kN load ratings, 7.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5670 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6319ZZ on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6319-ZZ-NTN bearing?", "a": "A 6319-ZZ-NTN deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6319-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6319-ZZ-NTN need?", "a": "6319-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 6319?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6319ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×200×45 mm ISO 15 envelope." }, { "q": "Is 6319ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6319-zz", "6319zz", "6319-ZZ", "6319ZZ", "6319-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61820-NTN", "brand": "NTN", "manufacturer_designation": "6820", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.7, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.33, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 313, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 100 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6220.", "The open 61820-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 100×125×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61820 units.", "Never mix components between two 61820-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 100 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61820 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 100 mm bore 61820 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61820; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.7 kN dynamic load rating (C) and 21.2 kN static (C0), 1.33 kN fatigue load limit Cu, 61820 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 313 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.7/21.2 kN load ratings, 1.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 313 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6820 on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61820 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61820-NTN bearing?", "a": "A 61820-NTN deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61820 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61820 uses the same ISO 15 envelope (100×125×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61820?", "a": "NTN lists the open 61820 under the bare designation 6820; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 100 mm bore envelope." }, { "q": "Does NTN offer 61820 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6820 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6820", "61820", "61820-NTN" ], "locale_variants": {} }, { "sku": "61820-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6820LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.7, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.33, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 313, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6820LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61820 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "Contact seals add drag and heat: 61820-2RS-NTN runs slower and cooler-limited than the open 61820; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61820-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61820-2RS-NTN drags the lip and overheats it.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61820-2RS-NTN.", "NTN catalogues the contact-sealed version as 6820LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 100 mm bore 61820 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2700 r/min for 61820; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.7 kN dynamic load rating (C) and 21.2 kN static (C0), 1.33 kN fatigue load limit Cu, 61820 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 313 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.7/21.2 kN load ratings, 1.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 313 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6820LLU on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive.", "Order the C3 internal-clearance version (61820 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61820 is listed." ], "faq": [ { "q": "What are the dimensions of a 61820-2RS-NTN bearing?", "a": "A 61820-2RS-NTN deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61820 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61820 uses the same ISO 15 envelope (100×125×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61820-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61820-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61820 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61820?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6820LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×125×13 mm ISO 15 envelope." }, { "q": "Is 6820LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-llu", "6820llu", "61820-2RS", "61820-2rs", "6820LLU", "61820-2RS-NTN" ], "locale_variants": {} }, { "sku": "61820-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6820LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.7, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.33, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 313, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61820-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 125 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6820LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 100 mm of 61820-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "The low-drag lip of 61820-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61820-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61820-RSR-NTN drags the lip and overheats it.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues this low-friction non-contact seal as 6820LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 100 mm bore 61820 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61820; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.7 kN dynamic load rating (C) and 21.2 kN static (C0), 1.33 kN fatigue load limit Cu, 61820 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 313 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.7/21.2 kN load ratings, 1.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 313 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6820LLB on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61820 is listed." ], "faq": [ { "q": "What are the dimensions of a 61820-RSR-NTN bearing?", "a": "A 61820-RSR-NTN deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61820 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61820 uses the same ISO 15 envelope (100×125×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61820?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6820LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×125×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61820 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6820LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-llb", "6820llb", "61820-RSR", "61820-rsr", "6820LLB", "61820-RSR-NTN" ], "locale_variants": {} }, { "sku": "61820-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6820ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.7, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.33, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 313, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61820-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 125 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6820ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "Do not wash 61820-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61820-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61820-ZZ-NTN drags the lip and overheats it.", "NTN catalogues the shielded version as 6820ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 100 mm bore 61820 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61820; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.7 kN dynamic load rating (C) and 21.2 kN static (C0), 1.33 kN fatigue load limit Cu, 61820 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 313 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.7/21.2 kN load ratings, 1.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 313 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6820ZZ on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61820 is listed." ], "faq": [ { "q": "What are the dimensions of a 61820-ZZ-NTN bearing?", "a": "A 61820-ZZ-NTN deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61820-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61820?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6820ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×125×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61820 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6820ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-zz", "6820zz", "61820-ZZ", "6820ZZ", "61820-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61920-NTN", "brand": "NTN", "manufacturer_designation": "6920", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45.5, "static_load_kN": 39.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 785, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61920-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 100×140×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61920 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 61920-NTN drags the lip and overheats it.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61920 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 100 mm bore 61920 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 61920; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61920 at 45.5 kN dynamic (C) and 39.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 785 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 45.5/39.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 785 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6920 on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive.", "Order the C3 internal-clearance version (61920 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61920 is listed." ], "faq": [ { "q": "What are the dimensions of a 61920-NTN bearing?", "a": "A 61920-NTN deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61920-NTN need?", "a": "The open 61920-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61920 bore code work?", "a": "The last two digits of 61920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61920?", "a": "NTN lists the open 61920 under the bare designation 6920; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 100 mm bore envelope." }, { "q": "Is 6920 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "full", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6920", "61920", "61920-NTN" ], "locale_variants": {} }, { "sku": "61920-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6920LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45.5, "static_load_kN": 39.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 785, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6920LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61920 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61920-2RS-NTN runs slower and cooler-limited than the open 61920; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61920-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61920-2RS-NTN.", "The housing bore for the 140 mm OD should be round within IT7; an oval bore pinches the outer ring of 61920-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6920LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 100 mm bore 61920 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2600 r/min for 61920; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61920 at 45.5 kN dynamic (C) and 39.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 785 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 45.5/39.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 785 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6920LLU on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61920-2RS-NTN bearing?", "a": "A 61920-2RS-NTN deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61920 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61920 uses the same ISO 15 envelope (100×140×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61920-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61920-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61920 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61920?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6920LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×140×20 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6920LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61920-llu", "6920llu", "61920-2RS", "61920-2rs", "6920LLU", "61920-2RS-NTN" ], "locale_variants": {} }, { "sku": "61920-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6920LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45.5, "static_load_kN": 39.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 785, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61920-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 140 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6920LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 100 mm of 61920-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61920-RSR-NTN run faster than contact-seal 61920-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61920-2RS instead.", "The low-drag lip of 61920-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61920-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues this low-friction non-contact seal as 6920LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 100 mm bore 61920 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 61920; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61920 at 45.5 kN dynamic (C) and 39.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 785 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 45.5/39.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 785 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6920LLB on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61920 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61920-RSR-NTN bearing?", "a": "A 61920-RSR-NTN deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61920 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61920 uses the same ISO 15 envelope (100×140×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61920?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6920LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×140×20 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6920LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61920-llb", "6920llb", "61920-RSR", "61920-rsr", "6920LLB", "61920-RSR-NTN" ], "locale_variants": {} }, { "sku": "61920-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6920ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45.5, "static_load_kN": 39.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 785, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61920-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 140 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6920ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61920 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61920-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61920-2RS for that.", "Shielded 61920-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6920ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 100 mm bore 61920 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 61920; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61920 at 45.5 kN dynamic (C) and 39.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 785 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 45.5/39.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 785 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6920ZZ on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 61920 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61920-ZZ-NTN bearing?", "a": "A 61920-ZZ-NTN deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61920-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61920?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6920ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×140×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 61920 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6920ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61920-zz", "6920zz", "61920-ZZ", "6920ZZ", "61920-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16020", "brand": "NTN", "manufacturer_designation": "16020", "series": "16000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 36.5, "fatigue_load_limit_kN": 2.18, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 910, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16020 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 20 by five gives the 100 mm bore; the 150 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 100 mm of 16020 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 160xx narrow section at 100 mm bore shares the 150 mm outside diameter of the 6020 but is only 16 mm wide; a 6020 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16020 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×150×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16020 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16020.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16020 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 100 mm bore 16020 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4200 r/min for 16020; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16020 at 39 kN dynamic (C) and 36.5 kN static (C0), 2.18 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 910 g, 16020 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×150×16 mm envelope of 16020 gives a D/d ratio of 1.50 and 25.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 39/36.5 kN load ratings, 2.18 kN fatigue load limit Cu NTN lists the grease limiting speed at 4200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16020 on the 100×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16020 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 16020 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16020 bearing?", "a": "A 16020 deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 16 mm width (3.937 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 16020 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 16020 need?", "a": "The open 16020 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 16020?", "a": "NTN lists the open 16020 under the bare designation 16020; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 100 mm bore envelope." }, { "q": "Is 16020 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16020" ], "locale_variants": {} }, { "sku": "6220-NTN", "brand": "NTN", "manufacturer_designation": "6220", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 93, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 3140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6220 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6220 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 100 mm bore the 62xx light series is the workhorse section; its 180×34 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6220-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6220 units.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 180 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6220-NTN.", "The open 6220 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 100 mm bore 6220 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6220; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 135 kN dynamic load rating (C) and 93 kN static (C0), 6.15 kN fatigue load limit Cu, 6220 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3140 g (3.1 kg), 6220 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 135/93 kN load ratings, 6.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3140 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6220 on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6220-NTN bearing?", "a": "A 6220-NTN deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6220-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6220-NTN need?", "a": "The open 6220-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6220?", "a": "NTN lists the open 6220 under the bare designation 6220; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 100 mm bore envelope." }, { "q": "What cage does NTN fit in 6220?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6220", "6220-NTN" ], "locale_variants": {} }, { "sku": "6220-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6220LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 93, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 3140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6220-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6220LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 100 mm of 6220-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6220-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6220-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the contact-sealed version as 6220LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 100 mm bore 6220 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2300 r/min for 6220; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 135 kN dynamic load rating (C) and 93 kN static (C0), 6.15 kN fatigue load limit Cu, 6220 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3140 g (3.1 kg), 6220 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 135/93 kN load ratings, 6.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3140 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6220LLU on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive.", "Order the C3 internal-clearance version (6220 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6220 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6220-2RS-NTN bearing?", "a": "A 6220-2RS-NTN deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6220-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6220-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6220 and verify the residual clearance after mounting." }, { "q": "How should 6220-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6220?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6220LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×180×34 mm ISO 15 envelope." }, { "q": "Is 6220LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6220-llu", "6220llu", "6220-2RS", "6220-2rs", "6220LLU", "6220-2RS-NTN" ], "locale_variants": {} }, { "sku": "6220-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6220LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 93, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 3140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6220LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6220 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 100 mm bore the 62xx light series is the workhorse section; its 180×34 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The low-drag lip of 6220-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6220-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 34 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6220LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 100 mm bore 6220 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6220; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 135 kN dynamic load rating (C) and 93 kN static (C0), 6.15 kN fatigue load limit Cu, 6220 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3140 g (3.1 kg), 6220 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 135/93 kN load ratings, 6.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3140 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6220LLB on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6220-RSR-NTN bearing?", "a": "A 6220-RSR-NTN deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6220 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6220 uses the same ISO 15 envelope (100×180×34 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6220-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6220-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6220 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6220?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6220LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×180×34 mm ISO 15 envelope." }, { "q": "Does NTN offer 6220 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6220LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6220-llb", "6220llb", "6220-RSR", "6220-rsr", "6220LLB", "6220-RSR-NTN" ], "locale_variants": {} }, { "sku": "6220-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6220ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 93, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 3140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6220ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6220-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6220-2RS for that.", "Do not wash 6220-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6220-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6220ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 100 mm bore 6220 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6220; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 135 kN dynamic load rating (C) and 93 kN static (C0), 6.15 kN fatigue load limit Cu, 6220 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3140 g (3.1 kg), 6220 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 135/93 kN load ratings, 6.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3140 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6220ZZ on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive.", "Order the C3 internal-clearance version (6220 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6220 is listed." ], "faq": [ { "q": "What are the dimensions of a 6220-ZZ-NTN bearing?", "a": "A 6220-ZZ-NTN deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6220-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6220?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6220ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×180×34 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6220ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6220-zz", "6220zz", "6220-ZZ", "6220ZZ", "6220-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6320-NTN", "brand": "NTN", "manufacturer_designation": "6320", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "The open 6320-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 100×215×47 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6320 units.", "Never mix components between two 6320-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6320 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 100 mm bore 6320 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6320; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 192 kN dynamic load rating (C) and 141 kN static (C0), 8.75 kN fatigue load limit Cu, 6320 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7000 g (7.0 kg), 6320 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 192/141 kN load ratings, 8.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6320 on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6320 is listed." ], "faq": [ { "q": "What are the dimensions of a 6320-NTN bearing?", "a": "A 6320-NTN deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6320 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6320 uses the same ISO 15 envelope (100×215×47 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6320?", "a": "NTN lists the open 6320 under the bare designation 6320; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 100 mm bore envelope." }, { "q": "What cage does NTN fit in 6320?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6320", "6320-NTN" ], "locale_variants": {} }, { "sku": "6320-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6320LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6320-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 215 mm outside diameter and 47 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6320LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6320 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "Contact seals add drag and heat: 6320-2RS-NTN runs slower and cooler-limited than the open 6320; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6320-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 100 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6320-2RS-NTN.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 47 mm-wide ring of 6320-2RS-NTN drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6320LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 100 mm bore 6320 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2200 r/min for 6320; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 192 kN dynamic load rating (C) and 141 kN static (C0), 8.75 kN fatigue load limit Cu, 6320 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7000 g (7.0 kg), 6320 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 192/141 kN load ratings, 8.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 2200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6320LLU on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6320 is listed.", "Order the C3 internal-clearance version (6320 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6320-2RS-NTN bearing?", "a": "A 6320-2RS-NTN deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6320-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN suffix for a sealed 6320?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6320LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×215×47 mm ISO 15 envelope." }, { "q": "Does NTN offer 6320 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6320LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6320-llu", "6320llu", "6320-2RS", "6320-2rs", "6320LLU", "6320-2RS-NTN" ], "locale_variants": {} }, { "sku": "6320-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6320LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6320-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 215 mm outside diameter and 47 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6320LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6320 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 100 mm bore gains dynamic rating through larger rolling elements on a 215 mm OD; the penalty is mass and a lower limiting speed than the 6220 — do not specify it for speed-critical shafts.", "The low-drag lip of 6320-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6320-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 47 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6320LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 100 mm bore 6320 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6320; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 192 kN dynamic load rating (C) and 141 kN static (C0), 8.75 kN fatigue load limit Cu, 6320 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7000 g (7.0 kg), 6320 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 192/141 kN load ratings, 8.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6320LLB on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6320-RSR-NTN bearing?", "a": "A 6320-RSR-NTN deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6320-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6320-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6320 and verify the residual clearance after mounting." }, { "q": "How should 6320-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6320?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6320LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×215×47 mm ISO 15 envelope." }, { "q": "Does NTN offer 6320 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6320LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6320-llb", "6320llb", "6320-RSR", "6320-rsr", "6320LLB", "6320-RSR-NTN" ], "locale_variants": {} }, { "sku": "6320-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6320ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6320ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 100 mm of 6320-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "Do not wash 6320-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6320-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 6320-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6320ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 100 mm bore 6320 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6320; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 192 kN dynamic load rating (C) and 141 kN static (C0), 8.75 kN fatigue load limit Cu, 6320 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7000 g (7.0 kg), 6320 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 192/141 kN load ratings, 8.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6320ZZ on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive.", "Order the C3 internal-clearance version (6320 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6320-ZZ-NTN bearing?", "a": "A 6320-ZZ-NTN deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6320 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6320 uses the same ISO 15 envelope (100×215×47 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6320?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6320ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×215×47 mm ISO 15 envelope." }, { "q": "Does NTN offer 6320 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6320ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6320-zz", "6320zz", "6320-ZZ", "6320ZZ", "6320-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61821-NTN", "brand": "NTN", "manufacturer_designation": "6821", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22, "static_load_kN": 22, "fatigue_load_limit_kN": 1.35, "limiting_speed_rpm": 4600, "max_rpm": 4600, "weight_g": 330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61821 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 130 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 105 mm of 61821-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "The open 61821-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 105×130×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61821-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61821-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61821 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 105 mm bore 61821 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4600 r/min for 61821; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 22 kN dynamic load rating (C) and 22 kN static (C0), 1.35 kN fatigue load limit Cu, 61821 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 330 g, 61821 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×130×13 mm envelope of 61821 gives a D/d ratio of 1.24 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 22/22 kN load ratings, 1.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 4600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 330 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6821 on the 105×130×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61821 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61821 is listed." ], "faq": [ { "q": "What are the dimensions of a 61821-NTN bearing?", "a": "A 61821-NTN deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61821 mean?", "a": "A bare 61821 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 61821?", "a": "NTN lists the open 61821 under the bare designation 6821; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 105 mm bore envelope." }, { "q": "Does NTN offer 61821 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6821 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6821", "61821", "61821-NTN" ], "locale_variants": {} }, { "sku": "61821-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6821LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22, "static_load_kN": 22, "fatigue_load_limit_kN": 1.35, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6821LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 61821 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 105 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6221.", "Contact seals add drag and heat: 61821-2RS-NTN runs slower and cooler-limited than the open 61821; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61821-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6821LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 105 mm bore 61821 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2500 r/min for 61821; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 22 kN dynamic load rating (C) and 22 kN static (C0), 1.35 kN fatigue load limit Cu, 61821 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 330 g, 61821 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×130×13 mm envelope of 61821 gives a D/d ratio of 1.24 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 22/22 kN load ratings, 1.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 2500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 330 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6821LLU on the 105×130×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61821 in a rated drive.", "Order the C3 internal-clearance version (61821 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61821-2RS-NTN bearing?", "a": "A 61821-2RS-NTN deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61821-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61821-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61821 and verify the residual clearance after mounting." }, { "q": "How should 61821-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61821?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6821LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×130×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61821 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6821LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-llu", "6821llu", "61821-2RS", "61821-2rs", "6821LLU", "61821-2RS-NTN" ], "locale_variants": {} }, { "sku": "61821-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6821ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22, "static_load_kN": 22, "fatigue_load_limit_kN": 1.35, "limiting_speed_rpm": 4600, "max_rpm": 4600, "weight_g": 330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61821-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 130 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6821ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "Do not wash 61821-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61821-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61821-ZZ-NTN drags the lip and overheats it.", "NTN catalogues the shielded version as 6821ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 105 mm bore 61821 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4600 r/min for 61821; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 22 kN dynamic load rating (C) and 22 kN static (C0), 1.35 kN fatigue load limit Cu, 61821 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 330 g, 61821 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×130×13 mm envelope of 61821 gives a D/d ratio of 1.24 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 22/22 kN load ratings, 1.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 4600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 330 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6821ZZ on the 105×130×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61821 in a rated drive.", "Standard catalogue stock of 61821 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61821-ZZ-NTN bearing?", "a": "A 61821-ZZ-NTN deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 61821-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61821-ZZ-NTN need?", "a": "61821-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 61821?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6821ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×130×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61821 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6821ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-zz", "6821zz", "61821-ZZ", "6821ZZ", "61821-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61921-NTN", "brand": "NTN", "manufacturer_designation": "6921", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 47, "static_load_kN": 42, "fatigue_load_limit_kN": 2.52, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 816, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61921 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 145 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 105 mm of 61921-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61921-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61921 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 61921-NTN drags the lip and overheats it.", "The open 61921 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 105 mm bore 61921 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61921; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61921 at 47 kN dynamic (C) and 42 kN static (C0), 2.52 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 816 g, 61921 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×145×20 mm envelope of 61921 gives a D/d ratio of 1.38 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 47/42 kN load ratings, 2.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 816 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6921 on the 105×145×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61921 in a rated drive.", "Standard catalogue stock of 61921 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61921-NTN bearing?", "a": "A 61921-NTN deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 105 mm bore?", "a": "619 is a thin section one step above 618: 145×20 mm with a 20.0 mm radial section at 105 mm bore; a 6221 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61921 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61921 uses the same ISO 15 envelope (105×145×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61921?", "a": "NTN lists the open 61921 under the bare designation 6921; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 105 mm bore envelope." }, { "q": "What cage does NTN fit in 6921?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61921-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "full", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6921", "61921", "61921-NTN" ], "locale_variants": {} }, { "sku": "61921-2RS", "brand": "NTN", "manufacturer_designation": "6921LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 47, "static_load_kN": 42, "fatigue_load_limit_kN": 2.52, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 816, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61921-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 145 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6921LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 61921 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61921-2RS runs slower and cooler-limited than the open 61921; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61921-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6921LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 105 mm bore 61921 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2500 r/min for 61921; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61921 at 47 kN dynamic (C) and 42 kN static (C0), 2.52 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 816 g, 61921 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×145×20 mm envelope of 61921 gives a D/d ratio of 1.38 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 47/42 kN load ratings, 2.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 2500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 816 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6921LLU on the 105×145×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61921 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61921-2RS bearing?", "a": "A 61921-2RS deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61921-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 61921?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6921LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×145×20 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6921LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61921-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61921-llu", "6921llu", "61921-2RS", "61921-2rs", "6921LLU" ], "locale_variants": {} }, { "sku": "61921-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6921LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 47, "static_load_kN": 42, "fatigue_load_limit_kN": 2.52, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 816, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61921-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 145 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6921LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 105 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61921-RSR-NTN run faster than contact-seal 61921-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61921-2RS instead.", "The low-drag lip of 61921-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The housing bore for the 145 mm OD should be round within IT7; an oval bore pinches the outer ring of 61921-RSR-NTN and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues this low-friction non-contact seal as 6921LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 105 mm bore 61921 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61921; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61921 at 47 kN dynamic (C) and 42 kN static (C0), 2.52 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 816 g, 61921 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×145×20 mm envelope of 61921 gives a D/d ratio of 1.38 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 47/42 kN load ratings, 2.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 816 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6921LLB on the 105×145×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61921 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61921 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61921-RSR-NTN bearing?", "a": "A 61921-RSR-NTN deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 61921-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61921-RSR-NTN need?", "a": "61921-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61921 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61921?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6921LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×145×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 61921 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6921LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61921-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61921-llb", "6921llb", "61921-RSR", "61921-rsr", "6921LLB", "61921-RSR-NTN" ], "locale_variants": {} }, { "sku": "61921-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6921ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 47, "static_load_kN": 42, "fatigue_load_limit_kN": 2.52, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 816, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6921ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 61921 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 105 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61921-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61921-2RS for that.", "Shielded 61921-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 61921-ZZ-NTN drags the lip and overheats it.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6921ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 105 mm bore 61921 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61921; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61921 at 47 kN dynamic (C) and 42 kN static (C0), 2.52 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 816 g, 61921 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×145×20 mm envelope of 61921 gives a D/d ratio of 1.38 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 47/42 kN load ratings, 2.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 816 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6921ZZ on the 105×145×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61921 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61921 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61921-ZZ-NTN bearing?", "a": "A 61921-ZZ-NTN deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61921-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61921-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61921 and verify the residual clearance after mounting." }, { "q": "How should 61921-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61921?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6921ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×145×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 61921 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6921ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61921-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61921-zz", "6921zz", "61921-ZZ", "6921ZZ", "61921-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16021", "brand": "NTN", "manufacturer_designation": "16021", "series": "16000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 57.5, "static_load_kN": 50.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 1200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 105 mm of 16021 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 160xx narrow section at 105 mm bore shares the 160 mm outside diameter of the 6021 but is only 18 mm wide; a 6021 in a 18 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16021 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×160×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16021 units.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16021 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 105 mm bore 16021 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 16021; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16021 at 57.5 kN dynamic (C) and 50.5 kN static (C0), 3 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1200 g (1.2 kg), 16021 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 105×160×18 mm envelope of 16021 gives a D/d ratio of 1.52 and 27.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 57.5/50.5 kN load ratings, 3 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16021 on the 105×160×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16021 in a rated drive.", "Order the C3 internal-clearance version (16021 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16021 bearing?", "a": "A 16021 deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 18 mm width (4.134 × 6.299 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 16021 need?", "a": "The open 16021 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 16021 bore code work?", "a": "The last two digits of 16021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 16021?", "a": "NTN lists the open 16021 under the bare designation 16021; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 105 mm bore envelope." }, { "q": "Is 16021 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16021" ], "locale_variants": {} }, { "sku": "6221-NTN", "brand": "NTN", "manufacturer_designation": "6221", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 105, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 6221 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 105 mm bore the 62xx light series is the workhorse section; its 190×36 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6221-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 105×190×36 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6221 units.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6221 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 105 mm bore 6221 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3400 r/min for 6221; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 105 kN static (C0), 6.75 kN fatigue load limit Cu, 6221 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3700 g (3.7 kg), 6221 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 147/105 kN load ratings, 6.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6221 on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6221 is listed." ], "faq": [ { "q": "What are the dimensions of a 6221-NTN bearing?", "a": "A 6221-NTN deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6221-NTN have?", "a": "Unless a clearance suffix says otherwise, 6221-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6221 and verify the residual clearance after mounting." }, { "q": "How should 6221-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6221?", "a": "NTN lists the open 6221 under the bare designation 6221; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 105 mm bore envelope." }, { "q": "Is 6221 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6221", "6221-NTN" ], "locale_variants": {} }, { "sku": "6221-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6221LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 105, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6221LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 105 mm of 6221-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6221-2RS-NTN runs slower and cooler-limited than the open 6221; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6221-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6221-2RS-NTN.", "Measure the shaft, do not trust the drawing: a 105 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6221-2RS-NTN.", "NTN catalogues the contact-sealed version as 6221LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 105 mm bore 6221 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2300 r/min for 6221; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 105 kN static (C0), 6.75 kN fatigue load limit Cu, 6221 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3700 g (3.7 kg), 6221 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 147/105 kN load ratings, 6.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6221LLU on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6221 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6221-2RS-NTN bearing?", "a": "A 6221-2RS-NTN deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6221-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6221?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6221LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×190×36 mm ISO 15 envelope." }, { "q": "Is 6221LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6221-llu", "6221llu", "6221-2RS", "6221-2rs", "6221LLU", "6221-2RS-NTN" ], "locale_variants": {} }, { "sku": "6221-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6221LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 105, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6221-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 190 mm outside diameter and 36 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6221LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 105 mm of 6221-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6221-RSR-NTN run faster than contact-seal 6221-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6221-2RS instead.", "The low-drag lip of 6221-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues this low-friction non-contact seal as 6221LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 105 mm bore 6221 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3400 r/min for 6221; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 105 kN static (C0), 6.75 kN fatigue load limit Cu, 6221 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3700 g (3.7 kg), 6221 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 147/105 kN load ratings, 6.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6221LLB on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6221 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6221-RSR-NTN bearing?", "a": "A 6221-RSR-NTN deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6221-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 6221?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6221LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×190×36 mm ISO 15 envelope." }, { "q": "Is 6221LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6221-llb", "6221llb", "6221-RSR", "6221-rsr", "6221LLB", "6221-RSR-NTN" ], "locale_variants": {} }, { "sku": "6221-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6221ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 105, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6221ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 105 mm of 6221-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "Do not wash 6221-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6221-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6221ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 105 mm bore 6221 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3400 r/min for 6221; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 105 kN static (C0), 6.75 kN fatigue load limit Cu, 6221 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3700 g (3.7 kg), 6221 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 147/105 kN load ratings, 6.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6221ZZ on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive.", "Standard catalogue stock of 6221 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6221-ZZ-NTN bearing?", "a": "A 6221-ZZ-NTN deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6221-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6221?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6221ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×190×36 mm ISO 15 envelope." }, { "q": "Is 6221ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6221-zz", "6221zz", "6221-ZZ", "6221ZZ", "6221-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6321-NTN", "brand": "NTN", "manufacturer_designation": "6321", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 204, "static_load_kN": 153, "fatigue_load_limit_kN": 9.35, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 8050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6321 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 225 mm outside diameter and 49 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 105 mm of 6321-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 105 mm bore gains dynamic rating through larger rolling elements on a 225 mm OD; the penalty is mass and a lower limiting speed than the 6221 — do not specify it for speed-critical shafts.", "The open 6321-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 105×225×49 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6321 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6321 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 105 mm bore 6321 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3000 r/min for 6321; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 204 kN dynamic load rating (C) and 153 kN static (C0), 9.35 kN fatigue load limit Cu, 6321 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8050 g (8.1 kg), 6321 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 105×225×49 mm envelope of 6321 gives a D/d ratio of 2.14 and 60.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 204/153 kN load ratings, 9.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6321 on the 105×225×49 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6321 in a rated drive.", "Standard catalogue stock of 6321 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6321 is listed." ], "faq": [ { "q": "What are the dimensions of a 6321-NTN bearing?", "a": "A 6321-NTN deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6300 compare with other series at the same 105 mm bore?", "a": "The '3' is the medium diameter series: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 6221 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6321 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6321 uses the same ISO 15 envelope (105×225×49 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6321?", "a": "NTN lists the open 6321 under the bare designation 6321; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 105 mm bore envelope." }, { "q": "Does NTN offer 6321 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6321 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6321", "6321-NTN" ], "locale_variants": {} }, { "sku": "6321-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6321LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 204, "static_load_kN": 153, "fatigue_load_limit_kN": 9.35, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 8050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6321-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 225 mm outside diameter and 49 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6321LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 6321 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 105 mm bore gains dynamic rating through larger rolling elements on a 225 mm OD; the penalty is mass and a lower limiting speed than the 6221 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6321-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6321-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 49 mm-wide ring of 6321-2RS-NTN drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6321LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 105 mm bore 6321 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2100 r/min for 6321; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 204 kN dynamic load rating (C) and 153 kN static (C0), 9.35 kN fatigue load limit Cu, 6321 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8050 g (8.1 kg), 6321 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 105×225×49 mm envelope of 6321 gives a D/d ratio of 2.14 and 60.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 204/153 kN load ratings, 9.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6321LLU on the 105×225×49 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6321 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6321 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6321-2RS-NTN bearing?", "a": "A 6321-2RS-NTN deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6321-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6321-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6321 and verify the residual clearance after mounting." }, { "q": "How should 6321-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6321?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6321LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×225×49 mm ISO 15 envelope." }, { "q": "Does NTN offer 6321 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6321LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6321-llu", "6321llu", "6321-2RS", "6321-2rs", "6321LLU", "6321-2RS-NTN" ], "locale_variants": {} }, { "sku": "6321-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6321ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 204, "static_load_kN": 153, "fatigue_load_limit_kN": 9.35, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 8050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6321ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 105 mm of 6321-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 105 mm bore gains dynamic rating through larger rolling elements on a 225 mm OD; the penalty is mass and a lower limiting speed than the 6221 — do not specify it for speed-critical shafts.", "Do not wash 6321-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6321-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6321ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 105 mm bore 6321 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3000 r/min for 6321; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 204 kN dynamic load rating (C) and 153 kN static (C0), 9.35 kN fatigue load limit Cu, 6321 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8050 g (8.1 kg), 6321 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 105×225×49 mm envelope of 6321 gives a D/d ratio of 2.14 and 60.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 204/153 kN load ratings, 9.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6321ZZ on the 105×225×49 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6321 in a rated drive.", "Order the C3 internal-clearance version (6321 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6321-ZZ-NTN bearing?", "a": "A 6321-ZZ-NTN deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6321-ZZ-NTN need?", "a": "6321-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6321 bore code work?", "a": "The last two digits of 6321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6321?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6321ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×225×49 mm ISO 15 envelope." }, { "q": "Does NTN offer 6321 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6321ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6321-zz", "6321zz", "6321-ZZ", "6321ZZ", "6321-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61822-NTN", "brand": "NTN", "manufacturer_designation": "6822", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.5, "static_load_kN": 28.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 515, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 110 mm of 61822-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 110 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6222.", "The open 61822-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 110×140×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61822-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61822-NTN.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61822 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 110 mm bore 61822 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61822; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27.5 kN dynamic load rating (C) and 28.2 kN static (C0), 1.68 kN fatigue load limit Cu, 61822 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 515 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.5/28.2 kN load ratings, 1.68 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 515 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6822 on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61822 is listed.", "Order the C3 internal-clearance version (61822 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61822-NTN bearing?", "a": "A 61822-NTN deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61822-NTN have?", "a": "Unless a clearance suffix says otherwise, 61822-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61822 and verify the residual clearance after mounting." }, { "q": "How should 61822-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61822?", "a": "NTN lists the open 61822 under the bare designation 6822; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 110 mm bore envelope." }, { "q": "What cage does NTN fit in 6822?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822", "equiv_brand": "SKF", "level": "full", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6822", "61822", "61822-NTN" ], "locale_variants": {} }, { "sku": "61822-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6822LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.5, "static_load_kN": 28.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 515, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61822-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 140 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6822LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 61822 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "Heat is the enemy of the sealed 61822-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61822-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6822LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 110 mm bore 61822 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2400 r/min for 61822; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27.5 kN dynamic load rating (C) and 28.2 kN static (C0), 1.68 kN fatigue load limit Cu, 61822 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 515 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.5/28.2 kN load ratings, 1.68 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 515 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6822LLU on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61822 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61822-2RS-NTN bearing?", "a": "A 61822-2RS-NTN deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61822-2RS-NTN need?", "a": "61822-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61822 with a housing grease fitting instead." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61822?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6822LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×140×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6822LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61822-llu", "6822llu", "61822-2RS", "61822-2rs", "6822LLU", "61822-2RS-NTN" ], "locale_variants": {} }, { "sku": "61822-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6822LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.5, "static_load_kN": 28.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 515, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6822LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 110 mm of 61822-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 110 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6222.", "RSR low-friction seals on 61822-RSR-NTN run faster than contact-seal 61822-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61822-2RS instead.", "The low-drag lip of 61822-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6822LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 110 mm bore 61822 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61822; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27.5 kN dynamic load rating (C) and 28.2 kN static (C0), 1.68 kN fatigue load limit Cu, 61822 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 515 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.5/28.2 kN load ratings, 1.68 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 515 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6822LLB on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive.", "Standard catalogue stock of 61822 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61822-RSR-NTN bearing?", "a": "A 61822-RSR-NTN deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61822 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61822 uses the same ISO 15 envelope (110×140×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61822-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 61822-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61822 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61822?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6822LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×140×16 mm ISO 15 envelope." }, { "q": "Does NTN offer 61822 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6822LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61822-llb", "6822llb", "61822-RSR", "61822-rsr", "6822LLB", "61822-RSR-NTN" ], "locale_variants": {} }, { "sku": "61822-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6822ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.5, "static_load_kN": 28.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 515, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61822-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 140 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6822ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 110 mm of 61822-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 110 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6222.", "ZZ shields are non-contact: 61822-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61822-2RS for that.", "Shielded 61822-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61822-ZZ-NTN drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6822ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 110 mm bore 61822 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61822; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27.5 kN dynamic load rating (C) and 28.2 kN static (C0), 1.68 kN fatigue load limit Cu, 61822 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 515 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.5/28.2 kN load ratings, 1.68 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 515 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6822ZZ on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive.", "Order the C3 internal-clearance version (61822 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61822-ZZ-NTN bearing?", "a": "A 61822-ZZ-NTN deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 61822-ZZ-NTN need?", "a": "61822-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61822?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6822ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×140×16 mm ISO 15 envelope." }, { "q": "Is 6822ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61822-zz", "6822zz", "61822-ZZ", "6822ZZ", "61822-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61922-NTN", "brand": "NTN", "manufacturer_designation": "6922", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 4100, "max_rpm": 4100, "weight_g": 849, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 61922 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61922-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 110×150×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61922 units.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61922 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 110 mm bore 61922 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4100 r/min for 61922; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61922 at 48.5 kN dynamic (C) and 44.5 kN static (C0), 2.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 849 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 48.5/44.5 kN load ratings, 2.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 849 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6922 on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61922-NTN bearing?", "a": "A 61922-NTN deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61922-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61922-NTN need?", "a": "The open 61922-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61922?", "a": "NTN lists the open 61922 under the bare designation 6922; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 110 mm bore envelope." }, { "q": "What cage does NTN fit in 6922?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6922", "61922", "61922-NTN" ], "locale_variants": {} }, { "sku": "61922-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6922LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 849, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61922-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 150 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6922LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 61922 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61922-2RS-NTN runs slower and cooler-limited than the open 61922; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61922-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61922-2RS-NTN.", "NTN catalogues the contact-sealed version as 6922LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 110 mm bore 61922 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2400 r/min for 61922; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61922 at 48.5 kN dynamic (C) and 44.5 kN static (C0), 2.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 849 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 48.5/44.5 kN load ratings, 2.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 849 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6922LLU on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61922 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61922-2RS-NTN bearing?", "a": "A 61922-2RS-NTN deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61922 bore code work?", "a": "The last two digits of 61922 are bore code 22, giving 22 × 5 = 110 mm bore. The 150 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61922-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 61922?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6922LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×150×20 mm ISO 15 envelope." }, { "q": "Is 6922LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61922-llu", "6922llu", "61922-2RS", "61922-2rs", "6922LLU", "61922-2RS-NTN" ], "locale_variants": {} }, { "sku": "61922-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6922LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 4100, "max_rpm": 4100, "weight_g": 849, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6922LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 110 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61922-RSR-NTN run faster than contact-seal 61922-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61922-2RS instead.", "The low-drag lip of 61922-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6922LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 110 mm bore 61922 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4100 r/min for 61922; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61922 at 48.5 kN dynamic (C) and 44.5 kN static (C0), 2.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 849 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 48.5/44.5 kN load ratings, 2.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 849 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6922LLB on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61922 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61922-RSR-NTN bearing?", "a": "A 61922-RSR-NTN deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61922-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61922?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6922LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×150×20 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6922LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61922-llb", "6922llb", "61922-RSR", "61922-rsr", "6922LLB", "61922-RSR-NTN" ], "locale_variants": {} }, { "sku": "61922-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6922ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 4100, "max_rpm": 4100, "weight_g": 849, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6922ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 110 mm of 61922-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Do not wash 61922-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61922-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 110 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61922-ZZ-NTN.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 61922-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6922ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 110 mm bore 61922 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4100 r/min for 61922; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61922 at 48.5 kN dynamic (C) and 44.5 kN static (C0), 2.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 849 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 48.5/44.5 kN load ratings, 2.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 849 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6922ZZ on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive.", "Standard catalogue stock of 61922 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61922-ZZ-NTN bearing?", "a": "A 61922-ZZ-NTN deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61922-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61922?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6922ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×150×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 61922 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6922ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61922-zz", "6922zz", "61922-ZZ", "6922ZZ", "61922-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16022", "brand": "NTN", "manufacturer_designation": "16022", "series": "16000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63.5, "static_load_kN": 56.5, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 1460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 110 mm of 16022 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Because the 160xx narrow section shares the 170 mm OD of the 6022 at 110 mm bore but is only 19 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16022 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×170×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16022 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 16022 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16022-C3. No clearance suffix means normal CN clearance.", "The open 16022 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 110 mm bore 16022 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 16022; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16022 at 63.5 kN dynamic (C) and 56.5 kN static (C0), 3.25 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1460 g (1.5 kg), 16022 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 110×170×19 mm envelope of 16022 gives a D/d ratio of 1.55 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 63.5/56.5 kN load ratings, 3.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1460 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16022 on the 110×170×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16022 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16022 is listed." ], "faq": [ { "q": "What are the dimensions of a 16022 bearing?", "a": "A 16022 deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 19 mm width (4.331 × 6.693 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 16022 mean?", "a": "A bare 16022 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 110 mm bore?", "a": "160 is the narrow extra-light section: 170×19 mm with a 30.0 mm radial section at 110 mm bore. It has the same bore and outside diameter as the 6022 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN order number for an open 16022?", "a": "NTN lists the open 16022 under the bare designation 16022; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 110 mm bore envelope." }, { "q": "Does NTN offer 16022 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16022 is the correct choice." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16022" ], "locale_variants": {} }, { "sku": "6222-NTN", "brand": "NTN", "manufacturer_designation": "6222", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 160, "static_load_kN": 117, "fatigue_load_limit_kN": 7.35, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 4360, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6222 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6222-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6222 units.", "Measure the shaft, do not trust the drawing: a 110 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6222-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6222-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6222 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 110 mm bore 6222 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6222; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 160 kN dynamic load rating (C) and 117 kN static (C0), 7.35 kN fatigue load limit Cu, 6222 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4360 g (4.4 kg), 6222 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 160/117 kN load ratings, 7.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4360 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6222 on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6222 is listed." ], "faq": [ { "q": "What are the dimensions of a 6222-NTN bearing?", "a": "A 6222-NTN deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6222 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6222-NTN have?", "a": "Unless a clearance suffix says otherwise, 6222-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6222 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6222?", "a": "NTN lists the open 6222 under the bare designation 6222; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 110 mm bore envelope." }, { "q": "Is 6222 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222", "equiv_brand": "SKF", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6222", "6222-NTN" ], "locale_variants": {} }, { "sku": "6222-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6222LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 160, "static_load_kN": 117, "fatigue_load_limit_kN": 7.35, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 4360, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6222-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 200 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6222LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6222 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6222-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6222-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6222LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 110 mm bore 6222 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2200 r/min for 6222; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 160 kN dynamic load rating (C) and 117 kN static (C0), 7.35 kN fatigue load limit Cu, 6222 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4360 g (4.4 kg), 6222 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 160/117 kN load ratings, 7.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 2200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4360 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6222LLU on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive.", "Standard catalogue stock of 6222 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6222-2RS-NTN bearing?", "a": "A 6222-2RS-NTN deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "Are 6222 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6222?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6222LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×200×38 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6222LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6222-llu", "6222llu", "6222-2RS", "6222-2rs", "6222LLU", "6222-2RS-NTN" ], "locale_variants": {} }, { "sku": "6222-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6222LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 160, "static_load_kN": 117, "fatigue_load_limit_kN": 7.35, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 4360, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6222LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6222 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6222-RSR-NTN run faster than contact-seal 6222-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6222-2RS instead.", "The non-contact lip of 6222-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 6222-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6222LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 110 mm bore 6222 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6222; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 160 kN dynamic load rating (C) and 117 kN static (C0), 7.35 kN fatigue load limit Cu, 6222 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4360 g (4.4 kg), 6222 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 160/117 kN load ratings, 7.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4360 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6222LLB on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6222-RSR-NTN bearing?", "a": "A 6222-RSR-NTN deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6222-RSR-NTN need?", "a": "6222-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6222 with a housing grease fitting instead." }, { "q": "How does the 6222 bore code work?", "a": "The last two digits of 6222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6222?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6222LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×200×38 mm ISO 15 envelope." }, { "q": "Does NTN offer 6222 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6222LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6222-llb", "6222llb", "6222-RSR", "6222-rsr", "6222LLB", "6222-RSR-NTN" ], "locale_variants": {} }, { "sku": "6222-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6222ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 160, "static_load_kN": 117, "fatigue_load_limit_kN": 7.35, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 4360, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6222ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 110 mm of 6222-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6222-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6222-2RS for that.", "Do not wash 6222-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6222-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6222ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 110 mm bore 6222 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6222; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 160 kN dynamic load rating (C) and 117 kN static (C0), 7.35 kN fatigue load limit Cu, 6222 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4360 g (4.4 kg), 6222 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 160/117 kN load ratings, 7.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4360 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6222ZZ on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 6222 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6222-ZZ-NTN bearing?", "a": "A 6222-ZZ-NTN deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6222-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6222-ZZ-NTN need?", "a": "6222-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 6222?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6222ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×200×38 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6222ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6222-zz", "6222zz", "6222-ZZ", "6222ZZ", "6222-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6322-NTN", "brand": "NTN", "manufacturer_designation": "6322", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 9540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6322 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 240 mm outside diameter and 50 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6322 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 110 mm bore gains dynamic rating through larger rolling elements on a 240 mm OD; the penalty is mass and a lower limiting speed than the 6222 — do not specify it for speed-critical shafts.", "The open 6322-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 110×240×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6322-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6322 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 110 mm bore 6322 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6322; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 227 kN dynamic load rating (C) and 179 kN static (C0), 10.5 kN fatigue load limit Cu, 6322 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9540 g (9.5 kg), 6322 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 110×240×50 mm envelope of 6322 gives a D/d ratio of 2.18 and 65.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322 on the 110×240×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6322 in a rated drive.", "Order the C3 internal-clearance version (6322 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6322-NTN bearing?", "a": "A 6322-NTN deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6322-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6322-NTN need?", "a": "The open 6322-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6322?", "a": "NTN lists the open 6322 under the bare designation 6322; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 110 mm bore envelope." }, { "q": "Does NTN offer 6322 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6322 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6322", "6322-NTN" ], "locale_variants": {} }, { "sku": "6322-2RS", "brand": "NTN", "manufacturer_designation": "6322LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 9540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6322-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 240 mm outside diameter and 50 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6322LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 110 mm of 6322-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier rolling elements also trade away some speed versus a 6222.", "Contact seals add drag and heat: 6322-2RS runs slower and cooler-limited than the open 6322; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6322-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 6322-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6322LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 110 mm bore 6322 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 1900 r/min for 6322; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 227 kN dynamic load rating (C) and 179 kN static (C0), 10.5 kN fatigue load limit Cu, 6322 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9540 g (9.5 kg), 6322 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 110×240×50 mm envelope of 6322 gives a D/d ratio of 2.18 and 65.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322LLU on the 110×240×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6322 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6322-2RS bearing?", "a": "A 6322-2RS deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6322-2RS need?", "a": "6322-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6322 with a housing grease fitting instead." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6322?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6322LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×240×50 mm ISO 15 envelope." }, { "q": "Does NTN offer 6322 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6322LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6322-llu", "6322llu", "6322-2RS", "6322-2rs", "6322LLU" ], "locale_variants": {} }, { "sku": "6322-RSR", "brand": "NTN", "manufacturer_designation": "6322LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 9540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6322-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 240 mm outside diameter and 50 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6322LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6322 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 110 mm bore gains dynamic rating through larger rolling elements on a 240 mm OD; the penalty is mass and a lower limiting speed than the 6222 — do not specify it for speed-critical shafts.", "The low-drag lip of 6322-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6322-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Shaft and housing fillets must clear the bearing chamfer so the 50 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues this low-friction non-contact seal as 6322LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 110 mm bore 6322 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6322; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 227 kN dynamic load rating (C) and 179 kN static (C0), 10.5 kN fatigue load limit Cu, 6322 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9540 g (9.5 kg), 6322 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 110×240×50 mm envelope of 6322 gives a D/d ratio of 2.18 and 65.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322LLB on the 110×240×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6322 in a rated drive.", "Order the C3 internal-clearance version (6322 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6322-RSR bearing?", "a": "A 6322-RSR deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6322 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6322 uses the same ISO 15 envelope (110×240×50 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6322-RSR have?", "a": "Unless a clearance suffix says otherwise, 6322-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6322 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6322?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6322LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×240×50 mm ISO 15 envelope." }, { "q": "Is 6322LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6322-llb", "6322llb", "6322-RSR", "6322-rsr", "6322LLB" ], "locale_variants": {} }, { "sku": "6322-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6322ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 9540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6322ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium section at 110 mm bore gains dynamic rating through larger rolling elements on a 240 mm OD; the penalty is mass and a lower limiting speed than the 6222 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6322-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6322-2RS for that.", "Shielded 6322-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6322ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 110 mm bore 6322 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6322; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 227 kN dynamic load rating (C) and 179 kN static (C0), 10.5 kN fatigue load limit Cu, 6322 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9540 g (9.5 kg), 6322 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 110×240×50 mm envelope of 6322 gives a D/d ratio of 2.18 and 65.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322ZZ on the 110×240×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6322 in a rated drive.", "Standard catalogue stock of 6322 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6322-ZZ-NTN bearing?", "a": "A 6322-ZZ-NTN deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6322-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 6322?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6322ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×240×50 mm ISO 15 envelope." }, { "q": "Is 6322ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6322-zz", "6322zz", "6322-ZZ", "6322ZZ", "6322-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61824-NTN", "brand": "NTN", "manufacturer_designation": "6824", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32, "static_load_kN": 33, "fatigue_load_limit_kN": 1.89, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 555, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61824 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 150 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 120 mm bore the ring mass is significant: heat 61824 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 120 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6224.", "Storage matters for open bearings: 61824-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61824 units.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61824-NTN-C3. No clearance suffix means normal CN clearance.", "The open 61824 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 120 mm bore 61824 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 61824; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 32 kN dynamic load rating (C) and 33 kN static (C0), 1.89 kN fatigue load limit Cu, 61824 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 555 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 32/33 kN load ratings, 1.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 555 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6824 on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61824 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61824-NTN bearing?", "a": "A 61824-NTN deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61824 mean?", "a": "A bare 61824 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN order number for an open 61824?", "a": "NTN lists the open 61824 under the bare designation 6824; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 120 mm bore envelope." }, { "q": "Does NTN offer 61824 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6824 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6824", "61824", "61824-NTN" ], "locale_variants": {} }, { "sku": "61824-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6824LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32, "static_load_kN": 33, "fatigue_load_limit_kN": 1.89, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 555, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6824LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 120 mm bore the ring mass is significant: heat 61824 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "Contact seals add drag and heat: 61824-2RS-NTN runs slower and cooler-limited than the open 61824; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61824-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61824-2RS-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61824-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6824LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 120 mm bore 61824 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2200 r/min for 61824; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 32 kN dynamic load rating (C) and 33 kN static (C0), 1.89 kN fatigue load limit Cu, 61824 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 555 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 32/33 kN load ratings, 1.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 2200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 555 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6824LLU on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61824-2RS-NTN bearing?", "a": "A 61824-2RS-NTN deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61824-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61824?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6824LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×150×16 mm ISO 15 envelope." }, { "q": "Is 6824LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-llu", "6824llu", "61824-2RS", "61824-2rs", "6824LLU", "61824-2RS-NTN" ], "locale_variants": {} }, { "sku": "61824-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6824LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32, "static_load_kN": 33, "fatigue_load_limit_kN": 1.89, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 555, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6824LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 120 mm bore the ring mass is significant: heat 61824 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "RSR low-friction seals on 61824-RSR-NTN run faster than contact-seal 61824-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61824-2RS instead.", "The low-drag lip of 61824-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61824-RSR-NTN drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues this low-friction non-contact seal as 6824LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 120 mm bore 61824 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 61824; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 32 kN dynamic load rating (C) and 33 kN static (C0), 1.89 kN fatigue load limit Cu, 61824 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 555 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 32/33 kN load ratings, 1.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 555 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6824LLB on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61824 is listed." ], "faq": [ { "q": "What are the dimensions of a 61824-RSR-NTN bearing?", "a": "A 61824-RSR-NTN deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61824 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61824 uses the same ISO 15 envelope (120×150×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61824-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 61824-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61824 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61824?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6824LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×150×16 mm ISO 15 envelope." }, { "q": "Is 6824LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-llb", "6824llb", "61824-RSR", "61824-rsr", "6824LLB", "61824-RSR-NTN" ], "locale_variants": {} }, { "sku": "61824-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6824ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32, "static_load_kN": 33, "fatigue_load_limit_kN": 1.89, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 555, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6824ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 120 mm of 61824-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "Do not wash 61824-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61824-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61824-ZZ-NTN drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6824ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 120 mm bore 61824 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 61824; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 32 kN dynamic load rating (C) and 33 kN static (C0), 1.89 kN fatigue load limit Cu, 61824 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 555 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 32/33 kN load ratings, 1.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 555 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6824ZZ on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61824 is listed.", "Standard catalogue stock of 61824 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61824-ZZ-NTN bearing?", "a": "A 61824-ZZ-NTN deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61824 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61824 uses the same ISO 15 envelope (120×150×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61824?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6824ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×150×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6824ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-zz", "6824zz", "61824-ZZ", "6824ZZ", "61824-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61924-NTN", "brand": "NTN", "manufacturer_designation": "6924", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 59, "static_load_kN": 54, "fatigue_load_limit_kN": 3.05, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61924 carries bore code 24 = 120 mm. Outside diameter 165 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 120 mm bore (22.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61924-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61924 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 61924-NTN drags the lip and overheats it.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61924 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 120 mm bore 61924 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 61924; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61924 at 59 kN dynamic (C) and 54 kN static (C0), 3.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1150 g (1.1 kg), 61924 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×165×22 mm envelope of 61924 gives a D/d ratio of 1.38 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 59/54 kN load ratings, 3.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6924 on the 120×165×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61924 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 61924 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61924-NTN bearing?", "a": "A 61924-NTN deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61924-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61924-NTN need?", "a": "The open 61924-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61924?", "a": "NTN lists the open 61924 under the bare designation 6924; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 120 mm bore envelope." }, { "q": "What cage does NTN fit in 6924?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61924-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924", "equiv_brand": "SKF", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6924", "61924", "61924-NTN" ], "locale_variants": {} }, { "sku": "61924-2RS", "brand": "NTN", "manufacturer_designation": "6924LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 59, "static_load_kN": 54, "fatigue_load_limit_kN": 3.05, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61924 carries bore code 24 = 120 mm. Outside diameter 165 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6924LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 120 mm bore (22.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61924-2RS runs slower and cooler-limited than the open 61924; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61924-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61924-C3. No clearance suffix means normal CN clearance.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the contact-sealed version as 6924LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 120 mm bore 61924 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2100 r/min for 61924; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61924 at 59 kN dynamic (C) and 54 kN static (C0), 3.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1150 g (1.1 kg), 61924 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×165×22 mm envelope of 61924 gives a D/d ratio of 1.38 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 59/54 kN load ratings, 3.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6924LLU on the 120×165×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61924 in a rated drive.", "Standard catalogue stock of 61924 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61924 is listed." ], "faq": [ { "q": "What are the dimensions of a 61924-2RS bearing?", "a": "A 61924-2RS deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61924-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61924-2RS need?", "a": "61924-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61924 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61924?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6924LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×165×22 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6924LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61924-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61924-llu", "6924llu", "61924-2RS", "61924-2rs", "6924LLU" ], "locale_variants": {} }, { "sku": "61924-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6924ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 59, "static_load_kN": 54, "fatigue_load_limit_kN": 3.05, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61924-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 165 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6924ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 120 mm of 61924-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (22.5 mm section height at 120 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61924-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61924-2RS for that.", "Shielded 61924-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61924-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 165 mm OD should be round within IT7; an oval bore pinches the outer ring of 61924-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6924ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 120 mm bore 61924 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 61924; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61924 at 59 kN dynamic (C) and 54 kN static (C0), 3.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1150 g (1.1 kg), 61924 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×165×22 mm envelope of 61924 gives a D/d ratio of 1.38 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 59/54 kN load ratings, 3.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6924ZZ on the 120×165×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61924 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61924-ZZ-NTN bearing?", "a": "A 61924-ZZ-NTN deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61924-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 120 mm bore?", "a": "619 is a thin section one step above 618: 165×22 mm with a 22.5 mm radial section at 120 mm bore; a 6224 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61924?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6924ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×165×22 mm ISO 15 envelope." }, { "q": "Does NTN offer 61924 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6924ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61924-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61924-zz", "6924zz", "61924-ZZ", "6924ZZ", "61924-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6024-NTN", "brand": "NTN", "manufacturer_designation": "6024", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 79.5, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 2070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 120 mm of 6024-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 120 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6224 before committing to the smaller envelope.", "The open 6024-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 120×180×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6024 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 180 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6024-NTN.", "Never mix components between two 6024-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6024 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 120 mm bore 6024 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6024; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 79.5 kN static (C0), 4.65 kN fatigue load limit Cu, 6024 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2070 g (2.1 kg), 6024 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/79.5 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6024 on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive.", "Standard catalogue stock of 6024 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6024-NTN bearing?", "a": "A 6024-NTN deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6024 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6024 uses the same ISO 15 envelope (120×180×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6024?", "a": "NTN lists the open 6024 under the bare designation 6024; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 120 mm bore envelope." }, { "q": "What cage does NTN fit in 6024?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6024", "6024-NTN" ], "locale_variants": {} }, { "sku": "6024-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6024LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 79.5, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 2070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6024LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 120 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6224 before committing to the smaller envelope.", "Heat is the enemy of the sealed 6024-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6024-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6024LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 120 mm bore 6024 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2100 r/min for 6024; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 79.5 kN static (C0), 4.65 kN fatigue load limit Cu, 6024 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2070 g (2.1 kg), 6024 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/79.5 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6024LLU on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6024-2RS-NTN bearing?", "a": "A 6024-2RS-NTN deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6024 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6024 uses the same ISO 15 envelope (120×180×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6024?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6024LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×180×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6024LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6024-llu", "6024llu", "6024-2RS", "6024-2rs", "6024LLU", "6024-2RS-NTN" ], "locale_variants": {} }, { "sku": "6024-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6024LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 79.5, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 2070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6024LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The low-drag lip of 6024-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6024-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 120 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6024-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues this low-friction non-contact seal as 6024LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 120 mm bore 6024 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6024; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 79.5 kN static (C0), 4.65 kN fatigue load limit Cu, 6024 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2070 g (2.1 kg), 6024 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/79.5 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6024LLB on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive.", "Standard catalogue stock of 6024 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6024 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6024-RSR-NTN bearing?", "a": "A 6024-RSR-NTN deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6024-RSR-NTN need?", "a": "6024-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6024 with a housing grease fitting instead." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6024?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6024LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×180×28 mm ISO 15 envelope." }, { "q": "Does NTN offer 6024 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6024LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6024-llb", "6024llb", "6024-RSR", "6024-rsr", "6024LLB", "6024-RSR-NTN" ], "locale_variants": {} }, { "sku": "6024-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6024ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 79.5, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 2070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6024-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 180 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6024ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 120 mm of 6024-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 120 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6224 before committing to the smaller envelope.", "Do not wash 6024-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6024-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6024-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6024ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 120 mm bore 6024 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6024; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 79.5 kN static (C0), 4.65 kN fatigue load limit Cu, 6024 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2070 g (2.1 kg), 6024 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/79.5 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6024ZZ on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive.", "Standard catalogue stock of 6024 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6024-ZZ-NTN bearing?", "a": "A 6024-ZZ-NTN deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6024-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN suffix for a sealed 6024?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6024ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×180×28 mm ISO 15 envelope." }, { "q": "Does NTN offer 6024 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6024ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6024-zz", "6024zz", "6024-ZZ", "6024ZZ", "6024-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6224-NTN", "brand": "NTN", "manufacturer_designation": "6224", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 131, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 5150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "The open 6224-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 120×215×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6224 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 40 mm-wide ring of 6224-NTN drags the lip and overheats it.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6224 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 120 mm bore 6224 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6224; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 172 kN dynamic load rating (C) and 131 kN static (C0), 7.95 kN fatigue load limit Cu, 6224 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5150 g (5.2 kg), 6224 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×215×40 mm envelope of 6224 gives a D/d ratio of 1.79 and 47.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 172/131 kN load ratings, 7.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6224 on the 120×215×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6224 in a rated drive.", "Standard catalogue stock of 6224 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6224-NTN bearing?", "a": "A 6224-NTN deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6224-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6224-NTN need?", "a": "The open 6224-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6224?", "a": "NTN lists the open 6224 under the bare designation 6224; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 120 mm bore envelope." }, { "q": "What cage does NTN fit in 6224?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6224", "6224-NTN" ], "locale_variants": {} }, { "sku": "6224-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6224LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 131, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 5150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6224LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 120 mm of 6224-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 120 mm bore the 62xx light series is the workhorse section; its 215×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Heat is the enemy of the sealed 6224-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6224-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6224-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 120 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6224-2RS-NTN.", "NTN catalogues the contact-sealed version as 6224LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 120 mm bore 6224 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2000 r/min for 6224; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 172 kN dynamic load rating (C) and 131 kN static (C0), 7.95 kN fatigue load limit Cu, 6224 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5150 g (5.2 kg), 6224 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×215×40 mm envelope of 6224 gives a D/d ratio of 1.79 and 47.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 172/131 kN load ratings, 7.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6224LLU on the 120×215×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6224 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6224 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6224-2RS-NTN bearing?", "a": "A 6224-2RS-NTN deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6224 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6224 uses the same ISO 15 envelope (120×215×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6224-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6224-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6224 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6224?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6224LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×215×40 mm ISO 15 envelope." }, { "q": "Is 6224LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-llu", "6224llu", "6224-2RS", "6224-2rs", "6224LLU", "6224-2RS-NTN" ], "locale_variants": {} }, { "sku": "6224-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6224ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 131, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 5150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6224-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 215 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6224ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 120 mm of 6224-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "Do not wash 6224-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6224-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6224-ZZ-NTN.", "NTN catalogues the shielded version as 6224ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 120 mm bore 6224 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6224; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 172 kN dynamic load rating (C) and 131 kN static (C0), 7.95 kN fatigue load limit Cu, 6224 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5150 g (5.2 kg), 6224 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×215×40 mm envelope of 6224 gives a D/d ratio of 1.79 and 47.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 172/131 kN load ratings, 7.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6224ZZ on the 120×215×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6224 in a rated drive.", "Order the C3 internal-clearance version (6224 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6224 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6224-ZZ-NTN bearing?", "a": "A 6224-ZZ-NTN deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6224-ZZ-NTN need?", "a": "6224-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6224 bore code work?", "a": "The last two digits of 6224 are bore code 24, giving 24 × 5 = 120 mm bore. The 215 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6224?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6224ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×215×40 mm ISO 15 envelope." }, { "q": "Does NTN offer 6224 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6224ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-zz", "6224zz", "6224-ZZ", "6224ZZ", "6224-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6324-NTN", "brand": "NTN", "manufacturer_designation": "6324", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 185, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 12400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6324 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 260 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 120 mm bore the ring mass is significant: heat 6324 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 120 mm bore gains dynamic rating through larger rolling elements on a 260 mm OD; the penalty is mass and a lower limiting speed than the 6224 — do not specify it for speed-critical shafts.", "The open 6324-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 120×260×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6324-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 55 mm-wide ring of 6324-NTN drags the lip and overheats it.", "The open 6324 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 120 mm bore 6324 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2600 r/min for 6324; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 229 kN dynamic load rating (C) and 185 kN static (C0), 10.5 kN fatigue load limit Cu, 6324 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 12400 g (12.4 kg), 6324 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×260×55 mm envelope of 6324 gives a D/d ratio of 2.17 and 70.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 229/185 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 12400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6324 on the 120×260×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6324 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6324 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6324-NTN bearing?", "a": "A 6324-NTN deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6324 mean?", "a": "A bare 6324 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN order number for an open 6324?", "a": "NTN lists the open 6324 under the bare designation 6324; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 120 mm bore envelope." }, { "q": "What cage does NTN fit in 6324?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324", "equiv_brand": "SKF", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6324", "6324-NTN" ], "locale_variants": {} }, { "sku": "6324-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6324LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 185, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 12400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6324-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 260 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6324LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "Contact seals add drag and heat: 6324-2RS-NTN runs slower and cooler-limited than the open 6324; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6324-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 260 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6324-2RS-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6324LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 120 mm bore 6324 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 1700 r/min for 6324; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 229 kN dynamic load rating (C) and 185 kN static (C0), 10.5 kN fatigue load limit Cu, 6324 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 12400 g (12.4 kg), 6324 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×260×55 mm envelope of 6324 gives a D/d ratio of 2.17 and 70.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 229/185 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 12400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6324LLU on the 120×260×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6324 in a rated drive.", "Order the C3 internal-clearance version (6324 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6324 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6324-2RS-NTN bearing?", "a": "A 6324-2RS-NTN deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6324 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6324 uses the same ISO 15 envelope (120×260×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6324?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6324LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×260×55 mm ISO 15 envelope." }, { "q": "Does NTN offer 6324 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6324LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6324-llu", "6324llu", "6324-2RS", "6324-2rs", "6324LLU", "6324-2RS-NTN" ], "locale_variants": {} }, { "sku": "6324-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6324ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 185, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 12400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6324ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 120 mm of 6324-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 120 mm bore gains dynamic rating through larger rolling elements on a 260 mm OD; the penalty is mass and a lower limiting speed than the 6224 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6324-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6324-2RS for that.", "Shielded 6324-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 55 mm-wide ring of 6324-ZZ-NTN drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6324ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 120 mm bore 6324 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2600 r/min for 6324; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 229 kN dynamic load rating (C) and 185 kN static (C0), 10.5 kN fatigue load limit Cu, 6324 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 12400 g (12.4 kg), 6324 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×260×55 mm envelope of 6324 gives a D/d ratio of 2.17 and 70.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 229/185 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 12400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6324ZZ on the 120×260×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6324 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6324 is listed." ], "faq": [ { "q": "What are the dimensions of a 6324-ZZ-NTN bearing?", "a": "A 6324-ZZ-NTN deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6324-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6324-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6324 and verify the residual clearance after mounting." }, { "q": "How should 6324-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6324?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6324ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×260×55 mm ISO 15 envelope." }, { "q": "Does NTN offer 6324 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6324ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6324-zz", "6324zz", "6324-ZZ", "6324ZZ", "6324-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61826-NTN", "brand": "NTN", "manufacturer_designation": "6826", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41, "static_load_kN": 41, "fatigue_load_limit_kN": 2.25, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61826 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 165 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 61826 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 130 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6226.", "The open 61826-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 130×165×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61826-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61826 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 61826 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3700 r/min for 61826; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61826 at 41 kN dynamic (C) and 41 kN static (C0), 2.25 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 800 g, 61826 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 130×165×18 mm envelope of 61826 gives a D/d ratio of 1.27 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 41/41 kN load ratings, 2.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6826 on the 130×165×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61826 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 61826 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61826-NTN bearing?", "a": "A 61826-NTN deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61826-NTN need?", "a": "The open 61826-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61826?", "a": "NTN lists the open 61826 under the bare designation 6826; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "Does NTN offer 61826 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6826 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826", "equiv_brand": "SKF", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6826", "61826", "61826-NTN" ], "locale_variants": {} }, { "sku": "61826-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6826LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41, "static_load_kN": 41, "fatigue_load_limit_kN": 2.25, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6826LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 130 mm of 61826-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 130 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6226.", "Contact seals add drag and heat: 61826-2RS-NTN runs slower and cooler-limited than the open 61826; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61826-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 130 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61826-2RS-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6826LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 130 mm bore places 61826 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2000 r/min for 61826; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61826 at 41 kN dynamic (C) and 41 kN static (C0), 2.25 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 800 g, 61826 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 130×165×18 mm envelope of 61826 gives a D/d ratio of 1.27 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 41/41 kN load ratings, 2.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6826LLU on the 130×165×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61826 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61826 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61826-2RS-NTN bearing?", "a": "A 61826-2RS-NTN deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61826-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61826-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61826 and verify the residual clearance after mounting." }, { "q": "How should 61826-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61826?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6826LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×165×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 61826 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6826LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61826-llu", "6826llu", "61826-2RS", "61826-2rs", "6826LLU", "61826-2RS-NTN" ], "locale_variants": {} }, { "sku": "61826-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6826ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41, "static_load_kN": 41, "fatigue_load_limit_kN": 2.25, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61826-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 165 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6826ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 61826 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 130 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6226.", "ZZ shields are non-contact: 61826-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61826-2RS for that.", "Shielded 61826-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 130 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6826ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 130 mm bore places 61826 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3700 r/min for 61826; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61826 at 41 kN dynamic (C) and 41 kN static (C0), 2.25 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 800 g, 61826 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 130×165×18 mm envelope of 61826 gives a D/d ratio of 1.27 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 41/41 kN load ratings, 2.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6826ZZ on the 130×165×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61826 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61826 is listed." ], "faq": [ { "q": "What are the dimensions of a 61826-ZZ-NTN bearing?", "a": "A 61826-ZZ-NTN deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61826 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61826 uses the same ISO 15 envelope (130×165×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61826-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61826-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61826 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61826?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6826ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×165×18 mm ISO 15 envelope." }, { "q": "Is 6826ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61826-zz", "6826zz", "61826-ZZ", "6826ZZ", "61826-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61926-NTN", "brand": "NTN", "manufacturer_designation": "6926", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 72, "static_load_kN": 67.5, "fatigue_load_limit_kN": 3.65, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61926 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 180 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 130 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61926-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61926 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 61926-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61926 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 61926 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3500 r/min for 61926; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 72 kN dynamic load rating (C) and 67.5 kN static (C0), 3.65 kN fatigue load limit Cu, 61926 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1520 g (1.5 kg), 61926 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×180×24 mm envelope of 61926 gives a D/d ratio of 1.38 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 72/67.5 kN load ratings, 3.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6926 on the 130×180×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61926 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61926 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61926-NTN bearing?", "a": "A 61926-NTN deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61926 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61926 uses the same ISO 15 envelope (130×180×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61926-NTN have?", "a": "Unless a clearance suffix says otherwise, 61926-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61926 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61926?", "a": "NTN lists the open 61926 under the bare designation 6926; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "Is 6926 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61926-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926", "equiv_brand": "SKF", "level": "full", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6926", "61926", "61926-NTN" ], "locale_variants": {} }, { "sku": "61926-2RS", "brand": "NTN", "manufacturer_designation": "6926LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 72, "static_load_kN": 67.5, "fatigue_load_limit_kN": 3.65, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6926LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 130 mm of 61926-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 130 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61926-2RS runs slower and cooler-limited than the open 61926; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61926-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 61926-2RS drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6926LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 130 mm bore places 61926 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1900 r/min for 61926; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 72 kN dynamic load rating (C) and 67.5 kN static (C0), 3.65 kN fatigue load limit Cu, 61926 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1520 g (1.5 kg), 61926 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×180×24 mm envelope of 61926 gives a D/d ratio of 1.38 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 72/67.5 kN load ratings, 3.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6926LLU on the 130×180×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61926 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61926-2RS bearing?", "a": "A 61926-2RS deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61926-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 130 mm bore?", "a": "619 is a thin section one step above 618: 180×24 mm with a 25.0 mm radial section at 130 mm bore; a 6226 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61926?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6926LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×180×24 mm ISO 15 envelope." }, { "q": "Does NTN offer 61926 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6926LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61926-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61926-llu", "6926llu", "61926-2RS", "61926-2rs", "6926LLU" ], "locale_variants": {} }, { "sku": "61926-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6926ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 72, "static_load_kN": 67.5, "fatigue_load_limit_kN": 3.65, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6926ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 130 mm of 61926-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (25.0 mm section height at 130 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61926-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61926-2RS for that.", "Do not wash 61926-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 180 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61926-ZZ-NTN.", "NTN catalogues the shielded version as 6926ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 130 mm bore places 61926 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3500 r/min for 61926; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 72 kN dynamic load rating (C) and 67.5 kN static (C0), 3.65 kN fatigue load limit Cu, 61926 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1520 g (1.5 kg), 61926 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×180×24 mm envelope of 61926 gives a D/d ratio of 1.38 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 72/67.5 kN load ratings, 3.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6926ZZ on the 130×180×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61926 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61926 is listed." ], "faq": [ { "q": "What are the dimensions of a 61926-ZZ-NTN bearing?", "a": "A 61926-ZZ-NTN deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61926-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61926-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61926 and verify the residual clearance after mounting." }, { "q": "How should 61926-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61926?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6926ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×180×24 mm ISO 15 envelope." }, { "q": "Does NTN offer 61926 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6926ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61926-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61926-zz", "6926zz", "61926-ZZ", "6926ZZ", "61926-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16026-NTN", "brand": "NTN", "manufacturer_designation": "16026", "series": "16000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.5, "static_load_kN": 79.5, "fatigue_load_limit_kN": 4.25, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 2310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 16026 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Because the 160xx narrow section shares the 200 mm OD of the 6026 at 130 mm bore but is only 22 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16026-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 130×200×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16026 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16026-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16026 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 16026 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3200 r/min for 16026; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 88.5 kN dynamic load rating (C) and 79.5 kN static (C0), 4.25 kN fatigue load limit Cu, 16026 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2310 g (2.3 kg), 16026 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×200×22 mm envelope of 16026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 88.5/79.5 kN load ratings, 4.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2310 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16026 on the 130×200×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16026 in a rated drive.", "Standard catalogue stock of 16026 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16026-NTN bearing?", "a": "A 16026-NTN deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 22 mm width (5.118 × 7.874 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 16026 mean?", "a": "A bare 16026 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 130 mm bore?", "a": "160 is the narrow extra-light section: 200×22 mm with a 35.0 mm radial section at 130 mm bore. It has the same bore and outside diameter as the 6026 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN order number for an open 16026?", "a": "NTN lists the open 16026 under the bare designation 16026; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "What cage does NTN fit in 16026?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16026", "equiv_brand": "FAG", "level": "full", "note": "Same 130×200×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16026", "16026-NTN" ], "locale_variants": {} }, { "sku": "6026-NTN", "brand": "NTN", "manufacturer_designation": "6026", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 118, "static_load_kN": 101, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 3160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6026 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 200 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 6026 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 130 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6226 before committing to the smaller envelope.", "Storage matters for open bearings: 6026-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6026 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6026-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6026 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 6026 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3200 r/min for 6026; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 118 kN dynamic load rating (C) and 101 kN static (C0), 5.7 kN fatigue load limit Cu, 6026 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3160 g (3.2 kg), 6026 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 118/101 kN load ratings, 5.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6026 on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6026-NTN bearing?", "a": "A 6026-NTN deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6026 bore code work?", "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6026 mean?", "a": "A bare 6026 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6026?", "a": "NTN lists the open 6026 under the bare designation 6026; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "What cage does NTN fit in 6026?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6026", "6026-NTN" ], "locale_variants": {} }, { "sku": "6026-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6026LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 118, "static_load_kN": 101, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 3160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6026LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 130 mm of 6026-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6026-2RS-NTN runs slower and cooler-limited than the open 6026; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6026-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6026LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 130 mm bore places 6026 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1900 r/min for 6026; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 118 kN dynamic load rating (C) and 101 kN static (C0), 5.7 kN fatigue load limit Cu, 6026 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3160 g (3.2 kg), 6026 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 118/101 kN load ratings, 5.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6026LLU on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6026 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6026-2RS-NTN bearing?", "a": "A 6026-2RS-NTN deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6026-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN suffix for a sealed 6026?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6026LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×200×33 mm ISO 15 envelope." }, { "q": "Is 6026LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6026-llu", "6026llu", "6026-2RS", "6026-2rs", "6026LLU", "6026-2RS-NTN" ], "locale_variants": {} }, { "sku": "6026-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6026ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 118, "static_load_kN": 101, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 3160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6026-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 200 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6026ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6026-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6026-2RS for that.", "Shielded 6026-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6026ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 130 mm bore places 6026 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3200 r/min for 6026; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 118 kN dynamic load rating (C) and 101 kN static (C0), 5.7 kN fatigue load limit Cu, 6026 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3160 g (3.2 kg), 6026 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 118/101 kN load ratings, 5.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6026ZZ on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6026 is listed." ], "faq": [ { "q": "What are the dimensions of a 6026-ZZ-NTN bearing?", "a": "A 6026-ZZ-NTN deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6026-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN suffix for a sealed 6026?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6026ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×200×33 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6026ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6026-zz", "6026zz", "6026-ZZ", "6026ZZ", "6026-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6226-NTN", "brand": "NTN", "manufacturer_designation": "6226", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 185, "static_load_kN": 146, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 5820, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6226 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 230 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6226-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 130×230×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6226 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 230 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6226-NTN.", "The open 6226 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 6226 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2700 r/min for 6226; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 185 kN dynamic load rating (C) and 146 kN static (C0), 8.55 kN fatigue load limit Cu, 6226 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5820 g (5.8 kg), 6226 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 130×230×40 mm envelope of 6226 gives a D/d ratio of 1.77 and 50.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 185/146 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5820 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6226 on the 130×230×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6226 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6226-NTN bearing?", "a": "A 6226-NTN deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6226 mean?", "a": "A bare 6226 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 130 mm bore?", "a": "The '2' is the light diameter series: 230×40 mm with a 50.0 mm radial section at 130 mm bore. A 6326 on the same bore is larger and higher-rated; a 6026 is smaller and lower-rated." }, { "q": "What is the NTN order number for an open 6226?", "a": "NTN lists the open 6226 under the bare designation 6226; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "Is 6226 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6226", "6226-NTN" ], "locale_variants": {} }, { "sku": "6226-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6226LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 185, "static_load_kN": 146, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 5820, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6226-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 230 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6226LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 130 mm of 6226-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6226-2RS-NTN runs slower and cooler-limited than the open 6226; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6226-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The housing bore for the 230 mm OD should be round within IT7; an oval bore pinches the outer ring of 6226-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6226LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 130 mm bore places 6226 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1800 r/min for 6226; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 185 kN dynamic load rating (C) and 146 kN static (C0), 8.55 kN fatigue load limit Cu, 6226 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5820 g (5.8 kg), 6226 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 130×230×40 mm envelope of 6226 gives a D/d ratio of 1.77 and 50.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 185/146 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5820 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6226LLU on the 130×230×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6226 in a rated drive.", "Order the C3 internal-clearance version (6226 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6226 is listed." ], "faq": [ { "q": "What are the dimensions of a 6226-2RS-NTN bearing?", "a": "A 6226-2RS-NTN deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6226-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6226-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6226 and verify the residual clearance after mounting." }, { "q": "How should 6226-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6226?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6226LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×230×40 mm ISO 15 envelope." }, { "q": "Is 6226LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-llu", "6226llu", "6226-2RS", "6226-2rs", "6226LLU", "6226-2RS-NTN" ], "locale_variants": {} }, { "sku": "6226-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6226ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 185, "static_load_kN": 146, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 5820, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6226-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 230 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6226ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 130 mm bore; before upgrading to a 6326 for extra capacity, confirm the housing accepts a 230 mm OD and 40 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6226-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6226-2RS for that.", "Shielded 6226-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 40 mm-wide ring of 6226-ZZ-NTN drags the lip and overheats it.", "NTN catalogues the shielded version as 6226ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 130 mm bore places 6226 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2700 r/min for 6226; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 185 kN dynamic load rating (C) and 146 kN static (C0), 8.55 kN fatigue load limit Cu, 6226 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5820 g (5.8 kg), 6226 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 130×230×40 mm envelope of 6226 gives a D/d ratio of 1.77 and 50.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 185/146 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5820 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6226ZZ on the 130×230×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6226 in a rated drive.", "Standard catalogue stock of 6226 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6226-ZZ-NTN bearing?", "a": "A 6226-ZZ-NTN deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6226-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6226-ZZ-NTN need?", "a": "6226-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 6226?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6226ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×230×40 mm ISO 15 envelope." }, { "q": "Does NTN offer 6226 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6226ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-zz", "6226zz", "6226-ZZ", "6226ZZ", "6226-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6326-NTN", "brand": "NTN", "manufacturer_designation": "6326", "series": "6300-series", "type": "deep_groove", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 254, "static_load_kN": 214, "fatigue_load_limit_kN": 11.7, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 15300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6326 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 280 mm outside diameter and 58 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 6326 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 130 mm bore gains dynamic rating through larger rolling elements on a 280 mm OD; the penalty is mass and a lower limiting speed than the 6226 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6326-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6326 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 280 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6326-NTN.", "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6326 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 6326 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 6326; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6326 at 254 kN dynamic (C) and 214 kN static (C0), 11.7 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 15300 g (15.3 kg), 6326 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 130×280×58 mm envelope of 6326 gives a D/d ratio of 2.15 and 75.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 254/214 kN load ratings, 11.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 15300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6326 on the 130×280×58 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6326 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6326-NTN bearing?", "a": "A 6326-NTN deep-groove ball bearing has a 130 mm bore, 280 mm outer diameter and 58 mm width (5.118 × 11.024 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6300 compare with other series at the same 130 mm bore?", "a": "The '3' is the medium diameter series: 280×58 mm, 75.0 mm radial section at 130 mm bore, carrying more load than a 6226 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6326 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6326 uses the same ISO 15 envelope (130×280×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6326?", "a": "NTN lists the open 6326 under the bare designation 6326; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "Is 6326 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6326-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6326-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6326-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6326", "equiv_brand": "SKF", "level": "full", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6326-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6326", "6326-NTN" ], "locale_variants": {} }, { "sku": "61828-NTN", "brand": "NTN", "manufacturer_designation": "6828", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.35, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "The open 61828-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 140×175×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61828-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61828-NTN drags the lip and overheats it.", "The open 61828 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 61828 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3400 r/min for 61828; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61828 at 42.5 kN dynamic (C) and 44.5 kN static (C0), 2.35 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 850 g, 61828 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 140×175×18 mm envelope of 61828 gives a D/d ratio of 1.25 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 42.5/44.5 kN load ratings, 2.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 850 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6828 on the 140×175×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61828 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61828-NTN bearing?", "a": "A 61828-NTN deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61828 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61828 uses the same ISO 15 envelope (140×175×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61828-NTN have?", "a": "Unless a clearance suffix says otherwise, 61828-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61828 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61828?", "a": "NTN lists the open 61828 under the bare designation 6828; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "What cage does NTN fit in 6828?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828", "equiv_brand": "SKF", "level": "full", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6828", "61828", "61828-NTN" ], "locale_variants": {} }, { "sku": "61828-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6828LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.35, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61828-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 175 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6828LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 61828 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 140 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6228.", "Contact seals add drag and heat: 61828-2RS-NTN runs slower and cooler-limited than the open 61828; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61828-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 175 mm OD should be round within IT7; an oval bore pinches the outer ring of 61828-2RS-NTN and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6828LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 140 mm bore places 61828 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1900 r/min for 61828; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61828 at 42.5 kN dynamic (C) and 44.5 kN static (C0), 2.35 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 850 g, 61828 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 140×175×18 mm envelope of 61828 gives a D/d ratio of 1.25 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 42.5/44.5 kN load ratings, 2.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 850 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6828LLU on the 140×175×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61828 in a rated drive.", "Order the C3 internal-clearance version (61828 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61828 is listed." ], "faq": [ { "q": "What are the dimensions of a 61828-2RS-NTN bearing?", "a": "A 61828-2RS-NTN deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61828-2RS-NTN need?", "a": "61828-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61828 with a housing grease fitting instead." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61828?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6828LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×175×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6828LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61828-llu", "6828llu", "61828-2RS", "61828-2rs", "6828LLU", "61828-2RS-NTN" ], "locale_variants": {} }, { "sku": "61828-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6828ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.35, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6828ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 140 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6228.", "Do not wash 61828-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61828-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 175 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61828-ZZ-NTN.", "NTN catalogues the shielded version as 6828ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 140 mm bore places 61828 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3400 r/min for 61828; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61828 at 42.5 kN dynamic (C) and 44.5 kN static (C0), 2.35 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 850 g, 61828 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 140×175×18 mm envelope of 61828 gives a D/d ratio of 1.25 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 42.5/44.5 kN load ratings, 2.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 850 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6828ZZ on the 140×175×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61828 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61828 is listed.", "Standard catalogue stock of 61828 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61828-ZZ-NTN bearing?", "a": "A 61828-ZZ-NTN deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61828-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61828?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6828ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×175×18 mm ISO 15 envelope." }, { "q": "Is 6828ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61828-zz", "6828zz", "61828-ZZ", "6828ZZ", "61828-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61928-NTN", "brand": "NTN", "manufacturer_designation": "6928", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 74, "static_load_kN": 71.5, "fatigue_load_limit_kN": 3.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 1620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 140 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61928-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 140×190×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61928 units.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61928-NTN-C3. No clearance suffix means normal CN clearance.", "The open 61928 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 61928 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3200 r/min for 61928; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 74 kN dynamic load rating (C) and 71.5 kN static (C0), 3.7 kN fatigue load limit Cu, 61928 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1620 g (1.6 kg), 61928 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×190×24 mm envelope of 61928 gives a D/d ratio of 1.36 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 74/71.5 kN load ratings, 3.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6928 on the 140×190×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61928 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (61928 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61928-NTN bearing?", "a": "A 61928-NTN deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61928 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61928 uses the same ISO 15 envelope (140×190×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61928?", "a": "NTN lists the open 61928 under the bare designation 6928; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "Is 6928 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61928-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6928", "61928", "61928-NTN" ], "locale_variants": {} }, { "sku": "61928-2RS", "brand": "NTN", "manufacturer_designation": "6928LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 74, "static_load_kN": 71.5, "fatigue_load_limit_kN": 3.7, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 1620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61928-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 190 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6928LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 140 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61928-2RS runs slower and cooler-limited than the open 61928; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61928-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 61928-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 61928-2RS drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6928LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 140 mm bore places 61928 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1800 r/min for 61928; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 74 kN dynamic load rating (C) and 71.5 kN static (C0), 3.7 kN fatigue load limit Cu, 61928 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1620 g (1.6 kg), 61928 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×190×24 mm envelope of 61928 gives a D/d ratio of 1.36 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 74/71.5 kN load ratings, 3.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6928LLU on the 140×190×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61928 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61928 is listed." ], "faq": [ { "q": "What are the dimensions of a 61928-2RS bearing?", "a": "A 61928-2RS deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61928-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61928?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6928LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×190×24 mm ISO 15 envelope." }, { "q": "Is 6928LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61928-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61928-llu", "6928llu", "61928-2RS", "61928-2rs", "6928LLU" ], "locale_variants": {} }, { "sku": "61928-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6928ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 74, "static_load_kN": 71.5, "fatigue_load_limit_kN": 3.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 1620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6928ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 140 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61928-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61928-2RS for that.", "Shielded 61928-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61928-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 140 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61928-ZZ-NTN.", "NTN catalogues the shielded version as 6928ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 140 mm bore places 61928 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3200 r/min for 61928; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 74 kN dynamic load rating (C) and 71.5 kN static (C0), 3.7 kN fatigue load limit Cu, 61928 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1620 g (1.6 kg), 61928 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×190×24 mm envelope of 61928 gives a D/d ratio of 1.36 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 74/71.5 kN load ratings, 3.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6928ZZ on the 140×190×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61928 in a rated drive.", "Standard catalogue stock of 61928 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61928 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61928-ZZ-NTN bearing?", "a": "A 61928-ZZ-NTN deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61928 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61928 uses the same ISO 15 envelope (140×190×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61928-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61928-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61928 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61928?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6928ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×190×24 mm ISO 15 envelope." }, { "q": "Is 6928ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61928-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61928-zz", "6928zz", "61928-ZZ", "6928ZZ", "61928-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16028-NTN", "brand": "NTN", "manufacturer_designation": "16028", "series": "16000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 91, "static_load_kN": 85, "fatigue_load_limit_kN": 4.35, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 2450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16028 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 28 by five gives the 140 mm bore; the 210 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 140 mm of 16028-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Because the 160xx narrow section shares the 210 mm OD of the 6028 at 140 mm bore but is only 22 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16028-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 140×210×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16028 units.", "The housing bore for the 210 mm OD should be round within IT7; an oval bore pinches the outer ring of 16028-NTN and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16028 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 16028 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3000 r/min for 16028; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 91 kN dynamic load rating (C) and 85 kN static (C0), 4.35 kN fatigue load limit Cu, 16028 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2450 g (2.5 kg), 16028 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×210×22 mm envelope of 16028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 91/85 kN load ratings, 4.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2450 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16028 on the 140×210×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16028 in a rated drive.", "Standard catalogue stock of 16028 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16028-NTN bearing?", "a": "A 16028-NTN deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 22 mm width (5.512 × 8.268 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 140 mm bore?", "a": "160 is the narrow extra-light section: 210×22 mm with a 35.0 mm radial section at 140 mm bore. It has the same bore and outside diameter as the 6028 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16028 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16028 uses the same ISO 15 envelope (140×210×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16028?", "a": "NTN lists the open 16028 under the bare designation 16028; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "Is 16028 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "16028", "equiv_brand": "FAG", "level": "full", "note": "Same 140×210×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16028", "16028-NTN" ], "locale_variants": {} }, { "sku": "6028-NTN", "brand": "NTN", "manufacturer_designation": "6028", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 122, "static_load_kN": 109, "fatigue_load_limit_kN": 5.85, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6028 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 210 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 140 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6228 before committing to the smaller envelope.", "Storage matters for open bearings: 6028-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6028 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 33 mm-wide ring of 6028-NTN drags the lip and overheats it.", "The open 6028 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 6028 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3000 r/min for 6028; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 122 kN dynamic load rating (C) and 109 kN static (C0), 5.85 kN fatigue load limit Cu, 6028 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3350 g (3.4 kg), 6028 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 122/109 kN load ratings, 5.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3350 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6028 on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6028 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6028-NTN bearing?", "a": "A 6028-NTN deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6028-NTN have?", "a": "Unless a clearance suffix says otherwise, 6028-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6028 and verify the residual clearance after mounting." }, { "q": "How should 6028-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6028?", "a": "NTN lists the open 6028 under the bare designation 6028; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "Does NTN offer 6028 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6028 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6028", "6028-NTN" ], "locale_variants": {} }, { "sku": "6028-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6028LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 122, "static_load_kN": 109, "fatigue_load_limit_kN": 5.85, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6028LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 6028 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6028-2RS-NTN runs slower and cooler-limited than the open 6028; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6028-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6028-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 140 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6028LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 140 mm bore places 6028 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1800 r/min for 6028; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 122 kN dynamic load rating (C) and 109 kN static (C0), 5.85 kN fatigue load limit Cu, 6028 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3350 g (3.4 kg), 6028 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 122/109 kN load ratings, 5.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3350 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6028LLU on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive.", "Standard catalogue stock of 6028 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6028-2RS-NTN bearing?", "a": "A 6028-2RS-NTN deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6028-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6028?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6028LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×210×33 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6028LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6028-llu", "6028llu", "6028-2RS", "6028-2rs", "6028LLU", "6028-2RS-NTN" ], "locale_variants": {} }, { "sku": "6028-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6028ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 122, "static_load_kN": 109, "fatigue_load_limit_kN": 5.85, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6028ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6028-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6028-2RS for that.", "Do not wash 6028-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6028-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6028-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6028ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 140 mm bore places 6028 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3000 r/min for 6028; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 122 kN dynamic load rating (C) and 109 kN static (C0), 5.85 kN fatigue load limit Cu, 6028 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3350 g (3.4 kg), 6028 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 122/109 kN load ratings, 5.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3350 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6028ZZ on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive.", "Order the C3 internal-clearance version (6028 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6028-ZZ-NTN bearing?", "a": "A 6028-ZZ-NTN deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6028-ZZ-NTN need?", "a": "6028-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6028?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6028ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×210×33 mm ISO 15 envelope." }, { "q": "Is 6028ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6028-zz", "6028zz", "6028-ZZ", "6028ZZ", "6028-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6228-NTN", "brand": "NTN", "manufacturer_designation": "6228", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 184, "static_load_kN": 150, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 7570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6228 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 250 mm outside diameter and 42 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.", "The open 6228-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 140×250×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6228 units.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6228 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 6228 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2500 r/min for 6228; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 184 kN dynamic load rating (C) and 150 kN static (C0), 8.4 kN fatigue load limit Cu, 6228 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7570 g (7.6 kg), 6228 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 140×250×42 mm envelope of 6228 gives a D/d ratio of 1.79 and 55.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 184/150 kN load ratings, 8.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 2500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7570 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6228 on the 140×250×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6228 in a rated drive.", "Order the C3 internal-clearance version (6228 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6228 is listed." ], "faq": [ { "q": "What are the dimensions of a 6228-NTN bearing?", "a": "A 6228-NTN deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 140 mm bore?", "a": "The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated." }, { "q": "Are 6228 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6228 uses the same ISO 15 envelope (140×250×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6228?", "a": "NTN lists the open 6228 under the bare designation 6228; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "Does NTN offer 6228 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6228 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6228-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6228", "6228-NTN" ], "locale_variants": {} }, { "sku": "6228-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6228LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 184, "static_load_kN": 150, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 7570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6228LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 6228 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6228-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6228-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6228LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 140 mm bore places 6228 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1600 r/min for 6228; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 184 kN dynamic load rating (C) and 150 kN static (C0), 8.4 kN fatigue load limit Cu, 6228 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7570 g (7.6 kg), 6228 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 140×250×42 mm envelope of 6228 gives a D/d ratio of 1.79 and 55.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 184/150 kN load ratings, 8.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7570 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6228LLU on the 140×250×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6228 in a rated drive.", "Order the C3 internal-clearance version (6228 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6228 is listed." ], "faq": [ { "q": "What are the dimensions of a 6228-2RS-NTN bearing?", "a": "A 6228-2RS-NTN deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6228-2RS-NTN need?", "a": "6228-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6228 with a housing grease fitting instead." }, { "q": "How does the 6228 bore code work?", "a": "The last two digits of 6228 are bore code 28, giving 28 × 5 = 140 mm bore. The 250 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6228?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6228LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×250×42 mm ISO 15 envelope." }, { "q": "Is 6228LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6228-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6228-llu", "6228llu", "6228-2RS", "6228-2rs", "6228LLU", "6228-2RS-NTN" ], "locale_variants": {} }, { "sku": "6228-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6228ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 184, "static_load_kN": 150, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 7570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6228ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 140 mm bore the 62xx light series is the workhorse section; its 250×42 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6228-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6228-2RS for that.", "Shielded 6228-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6228-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6228ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 140 mm bore places 6228 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2500 r/min for 6228; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 184 kN dynamic load rating (C) and 150 kN static (C0), 8.4 kN fatigue load limit Cu, 6228 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7570 g (7.6 kg), 6228 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 140×250×42 mm envelope of 6228 gives a D/d ratio of 1.79 and 55.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 184/150 kN load ratings, 8.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 2500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7570 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6228ZZ on the 140×250×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6228 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (6228 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6228-ZZ-NTN bearing?", "a": "A 6228-ZZ-NTN deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6228 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6228 uses the same ISO 15 envelope (140×250×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6228-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6228-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6228 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6228?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6228ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×250×42 mm ISO 15 envelope." }, { "q": "Is 6228ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6228-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6228-zz", "6228zz", "6228-ZZ", "6228ZZ", "6228-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6328-NTN", "brand": "NTN", "manufacturer_designation": "6328", "series": "6300-series", "type": "deep_groove", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 280, "static_load_kN": 246, "fatigue_load_limit_kN": 13, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6328 carries bore code 28 = 140 mm. Outside diameter 300 mm and width 62 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 140 mm of 6328-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 140 mm bore gains dynamic rating through larger rolling elements on a 300 mm OD; the penalty is mass and a lower limiting speed than the 6228 — do not specify it for speed-critical shafts.", "The open 6328-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 140×300×62 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6328 units.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 300 mm OD should be round within IT7; an oval bore pinches the outer ring of 6328-NTN and shows up later as two-point loaded raceway wear.", "The open 6328 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 6328 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2200 r/min for 6328; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6328 at 280 kN dynamic (C) and 246 kN static (C0), 13 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 18500 g (18.5 kg), 6328 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 140×300×62 mm envelope of 6328 gives a D/d ratio of 2.14 and 80.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 280/246 kN load ratings, 13 kN fatigue load limit Cu NTN lists the grease limiting speed at 2200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 18500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6328 on the 140×300×62 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6328 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6328-NTN bearing?", "a": "A 6328-NTN deep-groove ball bearing has a 140 mm bore, 300 mm outer diameter and 62 mm width (5.512 × 11.811 × 2.441 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6328-NTN have?", "a": "Unless a clearance suffix says otherwise, 6328-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6328 and verify the residual clearance after mounting." }, { "q": "How should 6328-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6328?", "a": "NTN lists the open 6328 under the bare designation 6328; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "Is 6328 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6328-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6328-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6328", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6328-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6328", "6328-NTN" ], "locale_variants": {} }, { "sku": "61830-NTN", "brand": "NTN", "manufacturer_designation": "6830", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 55, "fatigue_load_limit_kN": 2.8, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 1160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61830 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 190 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 61830 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 150 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6230.", "The open 61830-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 150×190×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61830-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61830-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61830 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 61830 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3100 r/min for 61830; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61830 at 53 kN dynamic (C) and 55 kN static (C0), 2.8 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1160 g (1.2 kg), 61830 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×190×20 mm envelope of 61830 gives a D/d ratio of 1.27 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53/55 kN load ratings, 2.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 3100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6830 on the 150×190×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61830 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61830-NTN bearing?", "a": "A 61830-NTN deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61830 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61830 uses the same ISO 15 envelope (150×190×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61830-NTN have?", "a": "Unless a clearance suffix says otherwise, 61830-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61830 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61830?", "a": "NTN lists the open 61830 under the bare designation 6830; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "What cage does NTN fit in 6830?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61830-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6830", "61830", "61830-NTN" ], "locale_variants": {} }, { "sku": "61830-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6830LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 55, "fatigue_load_limit_kN": 2.8, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 1160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6830LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 150 mm of 61830-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "Heat is the enemy of the sealed 61830-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61830-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61830-2RS-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61830-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6830LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 150 mm bore places 61830 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1700 r/min for 61830; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61830 at 53 kN dynamic (C) and 55 kN static (C0), 2.8 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1160 g (1.2 kg), 61830 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×190×20 mm envelope of 61830 gives a D/d ratio of 1.27 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53/55 kN load ratings, 2.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6830LLU on the 150×190×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61830 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61830 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61830-2RS-NTN bearing?", "a": "A 61830-2RS-NTN deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61830-2RS-NTN need?", "a": "61830-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61830 with a housing grease fitting instead." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61830?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6830LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×190×20 mm ISO 15 envelope." }, { "q": "Is 6830LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61830-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61830-llu", "6830llu", "61830-2RS", "61830-2rs", "6830LLU", "61830-2RS-NTN" ], "locale_variants": {} }, { "sku": "61830-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6830ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 55, "fatigue_load_limit_kN": 2.8, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 1160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61830-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 190 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6830ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 61830 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "ZZ shields are non-contact: 61830-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61830-2RS for that.", "Shielded 61830-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6830ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 150 mm bore places 61830 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3100 r/min for 61830; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61830 at 53 kN dynamic (C) and 55 kN static (C0), 2.8 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1160 g (1.2 kg), 61830 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×190×20 mm envelope of 61830 gives a D/d ratio of 1.27 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53/55 kN load ratings, 2.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 3100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6830ZZ on the 150×190×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61830 in a rated drive.", "Standard catalogue stock of 61830 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61830 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61830-ZZ-NTN bearing?", "a": "A 61830-ZZ-NTN deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61830-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61830-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61830 and verify the residual clearance after mounting." }, { "q": "How should 61830-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61830?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6830ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×190×20 mm ISO 15 envelope." }, { "q": "Is 6830ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61830-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61830-zz", "6830zz", "61830-ZZ", "6830ZZ", "61830-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61930-NTN", "brand": "NTN", "manufacturer_designation": "6930", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 90.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 2470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61930 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 210 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 61930 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 150 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61930-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61930 units.", "The housing bore for the 210 mm OD should be round within IT7; an oval bore pinches the outer ring of 61930-NTN and shows up later as two-point loaded raceway wear.", "Never mix components between two 61930-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61930 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 61930 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3000 r/min for 61930; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 90.5 kN static (C0), 4.55 kN fatigue load limit Cu, 61930 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2470 g (2.5 kg), 61930 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×210×28 mm envelope of 61930 gives a D/d ratio of 1.40 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/90.5 kN load ratings, 4.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2470 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6930 on the 150×210×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61930 in a rated drive.", "Order the C3 internal-clearance version (61930 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61930-NTN bearing?", "a": "A 61930-NTN deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61930-NTN have?", "a": "Unless a clearance suffix says otherwise, 61930-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61930 and verify the residual clearance after mounting." }, { "q": "How should 61930-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61930?", "a": "NTN lists the open 61930 under the bare designation 6930; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "Does NTN offer 61930 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6930 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61930-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930", "equiv_brand": "NSK", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6930", "61930", "61930-NTN" ], "locale_variants": {} }, { "sku": "61930-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6930LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 90.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 2470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61930-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 210 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6930LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 61930 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (30.0 mm section height at 150 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Heat is the enemy of the sealed 61930-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61930-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61930-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61930-2RS-NTN.", "NTN catalogues the contact-sealed version as 6930LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 150 mm bore places 61930 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1700 r/min for 61930; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 90.5 kN static (C0), 4.55 kN fatigue load limit Cu, 61930 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2470 g (2.5 kg), 61930 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×210×28 mm envelope of 61930 gives a D/d ratio of 1.40 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/90.5 kN load ratings, 4.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2470 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6930LLU on the 150×210×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61930 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61930-2RS-NTN bearing?", "a": "A 61930-2RS-NTN deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61930 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61930 uses the same ISO 15 envelope (150×210×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61930-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61930-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61930 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61930?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6930LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×210×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6930LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61930-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61930-llu", "6930llu", "61930-2RS", "61930-2rs", "6930LLU", "61930-2RS-NTN" ], "locale_variants": {} }, { "sku": "61930-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6930ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 90.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 2470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61930 carries bore code 30 = 150 mm. Outside diameter 210 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6930ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 61930 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 150 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61930-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61930-2RS for that.", "Do not wash 61930-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "The housing bore for the 210 mm OD should be round within IT7; an oval bore pinches the outer ring of 61930-ZZ-NTN and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6930ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 150 mm bore places 61930 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3000 r/min for 61930; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 90.5 kN static (C0), 4.55 kN fatigue load limit Cu, 61930 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2470 g (2.5 kg), 61930 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×210×28 mm envelope of 61930 gives a D/d ratio of 1.40 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/90.5 kN load ratings, 4.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2470 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6930ZZ on the 150×210×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61930 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61930 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61930-ZZ-NTN bearing?", "a": "A 61930-ZZ-NTN deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61930 bore code work?", "a": "The last two digits of 61930 are bore code 30, giving 30 × 5 = 150 mm bore. The 210 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61930-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 61930?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6930ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×210×28 mm ISO 15 envelope." }, { "q": "Does NTN offer 61930 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6930ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61930-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61930-zz", "6930zz", "61930-ZZ", "6930ZZ", "61930-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16030-NTN", "brand": "NTN", "manufacturer_designation": "16030", "series": "16000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 107, "static_load_kN": 101, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 3070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 150 mm of 16030-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Because the 160xx narrow section shares the 225 mm OD of the 6030 at 150 mm bore but is only 24 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16030-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 150×225×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16030-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16030-NTN.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16030 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 16030 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2800 r/min for 16030; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 107 kN dynamic load rating (C) and 101 kN static (C0), 5 kN fatigue load limit Cu, 16030 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3070 g (3.1 kg), 16030 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×225×24 mm envelope of 16030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 107/101 kN load ratings, 5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16030 on the 150×225×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16030 in a rated drive.", "Order the C3 internal-clearance version (16030 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 16030 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16030-NTN bearing?", "a": "A 16030-NTN deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 24 mm width (5.906 × 8.858 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 16030-NTN have?", "a": "Unless a clearance suffix says otherwise, 16030-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16030 and verify the residual clearance after mounting." }, { "q": "How should 16030-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 16030?", "a": "NTN lists the open 16030 under the bare designation 16030; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "What cage does NTN fit in 16030?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16030", "equiv_brand": "FAG", "level": "full", "note": "Same 150×225×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16030", "16030-NTN" ], "locale_variants": {} }, { "sku": "6030-NTN", "brand": "NTN", "manufacturer_designation": "6030", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 139, "static_load_kN": 126, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 4080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6030 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 150 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6230 before committing to the smaller envelope.", "Storage matters for open bearings: 6030-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6030 units.", "Never mix components between two 6030-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 225 mm OD should be round within IT7; an oval bore pinches the outer ring of 6030-NTN and shows up later as two-point loaded raceway wear.", "The open 6030 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 6030 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2800 r/min for 6030; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 139 kN dynamic load rating (C) and 126 kN static (C0), 6.55 kN fatigue load limit Cu, 6030 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4080 g (4.1 kg), 6030 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 139/126 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4080 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6030 on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6030 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6030-NTN bearing?", "a": "A 6030-NTN deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6030 mean?", "a": "A bare 6030 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6030?", "a": "NTN lists the open 6030 under the bare designation 6030; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "What cage does NTN fit in 6030?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6030", "6030-NTN" ], "locale_variants": {} }, { "sku": "6030-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6030LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 139, "static_load_kN": 126, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 4080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6030-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6030LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 6030 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Heat is the enemy of the sealed 6030-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6030-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6030-2RS-NTN.", "NTN catalogues the contact-sealed version as 6030LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 150 mm bore places 6030 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1700 r/min for 6030; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 139 kN dynamic load rating (C) and 126 kN static (C0), 6.55 kN fatigue load limit Cu, 6030 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4080 g (4.1 kg), 6030 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 139/126 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4080 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6030LLU on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6030 is listed." ], "faq": [ { "q": "What are the dimensions of a 6030-2RS-NTN bearing?", "a": "A 6030-2RS-NTN deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6030-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6030-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6030 and verify the residual clearance after mounting." }, { "q": "How should 6030-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6030?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6030LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×225×35 mm ISO 15 envelope." }, { "q": "Does NTN offer 6030 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6030LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6030-llu", "6030llu", "6030-2RS", "6030-2rs", "6030LLU", "6030-2RS-NTN" ], "locale_variants": {} }, { "sku": "6030-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6030ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 139, "static_load_kN": 126, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 4080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6030ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6030-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6030-2RS for that.", "Shielded 6030-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6030-ZZ-NTN.", "NTN catalogues the shielded version as 6030ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 150 mm bore places 6030 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2800 r/min for 6030; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 139 kN dynamic load rating (C) and 126 kN static (C0), 6.55 kN fatigue load limit Cu, 6030 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4080 g (4.1 kg), 6030 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 139/126 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4080 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6030ZZ on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6030-ZZ-NTN bearing?", "a": "A 6030-ZZ-NTN deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6030 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6030 uses the same ISO 15 envelope (150×225×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6030?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6030ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×225×35 mm ISO 15 envelope." }, { "q": "Does NTN offer 6030 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6030ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6030-zz", "6030zz", "6030-ZZ", "6030ZZ", "6030-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6230-NTN", "brand": "NTN", "manufacturer_designation": "6230", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 195, "static_load_kN": 168, "fatigue_load_limit_kN": 9.05, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 9410, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6230 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 270 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.", "The open 6230-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 150×270×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6230 units.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6230-NTN drags the lip and overheats it.", "The open 6230 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 6230 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 6230; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 195 kN dynamic load rating (C) and 168 kN static (C0), 9.05 kN fatigue load limit Cu, 6230 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9410 g (9.4 kg), 6230 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 150×270×45 mm envelope of 6230 gives a D/d ratio of 1.80 and 60.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 195/168 kN load ratings, 9.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9410 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6230 on the 150×270×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6230 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6230 is listed." ], "faq": [ { "q": "What are the dimensions of a 6230-NTN bearing?", "a": "A 6230-NTN deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6230 bore code work?", "a": "The last two digits of 6230 are bore code 30, giving 30 × 5 = 150 mm bore. The 270 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6230 mean?", "a": "A bare 6230 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6230?", "a": "NTN lists the open 6230 under the bare designation 6230; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "Is 6230 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6230-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6230", "6230-NTN" ], "locale_variants": {} }, { "sku": "6230-2RS", "brand": "NTN", "manufacturer_designation": "6230LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 195, "static_load_kN": 168, "fatigue_load_limit_kN": 9.05, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 9410, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6230LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 150 mm of 6230-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6230-2RS runs slower and cooler-limited than the open 6230; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6230-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6230LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 150 mm bore places 6230 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1500 r/min for 6230; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 195 kN dynamic load rating (C) and 168 kN static (C0), 9.05 kN fatigue load limit Cu, 6230 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9410 g (9.4 kg), 6230 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 150×270×45 mm envelope of 6230 gives a D/d ratio of 1.80 and 60.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 195/168 kN load ratings, 9.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9410 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6230LLU on the 150×270×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6230 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6230-2RS bearing?", "a": "A 6230-2RS deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6230-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6230?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6230LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×270×45 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6230LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6230-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6230-llu", "6230llu", "6230-2RS", "6230-2rs", "6230LLU" ], "locale_variants": {} }, { "sku": "6230-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6230ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 195, "static_load_kN": 168, "fatigue_load_limit_kN": 9.05, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 9410, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6230-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 270 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6230ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 150 mm of 6230-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 150 mm bore the 62xx light series is the workhorse section; its 270×45 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6230-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6230-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6230ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 150 mm bore places 6230 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 6230; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 195 kN dynamic load rating (C) and 168 kN static (C0), 9.05 kN fatigue load limit Cu, 6230 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9410 g (9.4 kg), 6230 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 150×270×45 mm envelope of 6230 gives a D/d ratio of 1.80 and 60.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 195/168 kN load ratings, 9.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9410 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6230ZZ on the 150×270×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6230 in a rated drive.", "Standard catalogue stock of 6230 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6230 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6230-ZZ-NTN bearing?", "a": "A 6230-ZZ-NTN deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "Are 6230 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6230 uses the same ISO 15 envelope (150×270×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6230?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6230ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×270×45 mm ISO 15 envelope." }, { "q": "Is 6230ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6230-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6230-zz", "6230zz", "6230-ZZ", "6230ZZ", "6230-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6330-NTN", "brand": "NTN", "manufacturer_designation": "6330", "series": "6300-series", "type": "deep_groove", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 305, "static_load_kN": 284, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 22000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6330 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 320 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 150 mm of 6330-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 150 mm bore gains dynamic rating through larger rolling elements on a 320 mm OD; the penalty is mass and a lower limiting speed than the 6230 — do not specify it for speed-critical shafts.", "The open 6330-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 150×320×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6330-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6330 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 6330 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2100 r/min for 6330; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6330 at 305 kN dynamic (C) and 284 kN static (C0), 14.5 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 22000 g (22.0 kg), 6330 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 150×320×65 mm envelope of 6330 gives a D/d ratio of 2.13 and 85.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 305/284 kN load ratings, 14.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 22000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6330 on the 150×320×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6330 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6330 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6330-NTN bearing?", "a": "A 6330-NTN deep-groove ball bearing has a 150 mm bore, 320 mm outer diameter and 65 mm width (5.906 × 12.598 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6330-NTN have?", "a": "Unless a clearance suffix says otherwise, 6330-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6330 and verify the residual clearance after mounting." }, { "q": "How should 6330-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6330?", "a": "NTN lists the open 6330 under the bare designation 6330; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "Does NTN offer 6330 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6330 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6330-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6330-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6330", "equiv_brand": "SKF", "level": "full", "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6330-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6330", "6330-NTN" ], "locale_variants": {} }, { "sku": "61832-NTN", "brand": "NTN", "manufacturer_designation": "6832", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53.5, "static_load_kN": 57, "fatigue_load_limit_kN": 2.82, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 1230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61832 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 200 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 160 mm bore the ring mass is significant: heat 61832 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 160 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6232.", "The open 61832-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 160×200×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61832-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 160 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61832-NTN.", "The open 61832 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 61832 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2900 r/min for 61832; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61832 at 53.5 kN dynamic (C) and 57 kN static (C0), 2.82 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1230 g (1.2 kg), 61832 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×200×20 mm envelope of 61832 gives a D/d ratio of 1.25 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53.5/57 kN load ratings, 2.82 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6832 on the 160×200×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61832 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61832-NTN bearing?", "a": "A 61832-NTN deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61832-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61832-NTN need?", "a": "The open 61832-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61832?", "a": "NTN lists the open 61832 under the bare designation 6832; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "Is 6832 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61832-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6832", "61832", "61832-NTN" ], "locale_variants": {} }, { "sku": "61832-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6832LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53.5, "static_load_kN": 57, "fatigue_load_limit_kN": 2.82, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 1230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61832-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 200 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6832LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 160 mm of 61832-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 160 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6232.", "Contact seals add drag and heat: 61832-2RS-NTN runs slower and cooler-limited than the open 61832; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61832-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61832-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61832-2RS-NTN.", "NTN catalogues the contact-sealed version as 6832LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 160 mm bore places 61832 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1600 r/min for 61832; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61832 at 53.5 kN dynamic (C) and 57 kN static (C0), 2.82 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1230 g (1.2 kg), 61832 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×200×20 mm envelope of 61832 gives a D/d ratio of 1.25 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53.5/57 kN load ratings, 2.82 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6832LLU on the 160×200×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61832 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61832 is listed.", "Standard catalogue stock of 61832 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61832-2RS-NTN bearing?", "a": "A 61832-2RS-NTN deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61832-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61832-2RS-NTN need?", "a": "61832-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61832 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61832?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6832LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×200×20 mm ISO 15 envelope." }, { "q": "Is 6832LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61832-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61832-llu", "6832llu", "61832-2RS", "61832-2rs", "6832LLU", "61832-2RS-NTN" ], "locale_variants": {} }, { "sku": "61832-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6832ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53.5, "static_load_kN": 57, "fatigue_load_limit_kN": 2.82, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 1230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6832ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 160 mm bore the ring mass is significant: heat 61832 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 160 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6232.", "ZZ shields are non-contact: 61832-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61832-2RS for that.", "Do not wash 61832-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 61832-ZZ-NTN drags the lip and overheats it.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6832ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 160 mm bore places 61832 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2900 r/min for 61832; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61832 at 53.5 kN dynamic (C) and 57 kN static (C0), 2.82 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1230 g (1.2 kg), 61832 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×200×20 mm envelope of 61832 gives a D/d ratio of 1.25 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53.5/57 kN load ratings, 2.82 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6832ZZ on the 160×200×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61832 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61832 is listed.", "Order the C3 internal-clearance version (61832 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61832-ZZ-NTN bearing?", "a": "A 61832-ZZ-NTN deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61832-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 160 mm bore?", "a": "618 is an extra-thin section: 200×20 mm, only 20.0 mm radial section at 160 mm bore, far smaller than a 6232, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61832?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6832ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×200×20 mm ISO 15 envelope." }, { "q": "Is 6832ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61832-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61832-zz", "6832zz", "61832-ZZ", "6832ZZ", "61832-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61932-NTN", "brand": "NTN", "manufacturer_designation": "6932", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 96.5, "static_load_kN": 96, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 2610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61932 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 220 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 160 mm bore the ring mass is significant: heat 61932 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (30.0 mm section height at 160 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61932-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61932 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61932-NTN-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 220 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61932-NTN.", "The open 61932 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 61932 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2800 r/min for 61932; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 96.5 kN dynamic load rating (C) and 96 kN static (C0), 4.65 kN fatigue load limit Cu, 61932 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2610 g (2.6 kg), 61932 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×220×28 mm envelope of 61932 gives a D/d ratio of 1.38 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 96.5/96 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2610 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6932 on the 160×220×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61932 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61932-NTN bearing?", "a": "A 61932-NTN deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61932 mean?", "a": "A bare 61932 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 160 mm bore?", "a": "619 is a thin section one step above 618: 220×28 mm with a 30.0 mm radial section at 160 mm bore; a 6232 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN order number for an open 61932?", "a": "NTN lists the open 61932 under the bare designation 6932; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "What cage does NTN fit in 6932?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61932-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932", "equiv_brand": "SKF", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6932", "61932", "61932-NTN" ], "locale_variants": {} }, { "sku": "61932-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6932LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 96.5, "static_load_kN": 96, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 2610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61932 carries bore code 32 = 160 mm. Outside diameter 220 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6932LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 160 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61932-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61932-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 220 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61932-2RS-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61932-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6932LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 160 mm bore places 61932 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1600 r/min for 61932; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 96.5 kN dynamic load rating (C) and 96 kN static (C0), 4.65 kN fatigue load limit Cu, 61932 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2610 g (2.6 kg), 61932 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×220×28 mm envelope of 61932 gives a D/d ratio of 1.38 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 96.5/96 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2610 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6932LLU on the 160×220×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61932 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 61932 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61932-2RS-NTN bearing?", "a": "A 61932-2RS-NTN deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61932 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61932 uses the same ISO 15 envelope (160×220×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61932-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61932-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61932 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61932?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6932LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×220×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6932LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61932-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61932-llu", "6932llu", "61932-2RS", "61932-2rs", "6932LLU", "61932-2RS-NTN" ], "locale_variants": {} }, { "sku": "61932-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6932ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 96.5, "static_load_kN": 96, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 2610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61932-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 220 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6932ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 160 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61932-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61932-2RS for that.", "Shielded 61932-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 220 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61932-ZZ-NTN.", "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61932-ZZ-NTN.", "NTN catalogues the shielded version as 6932ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 160 mm bore places 61932 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2800 r/min for 61932; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 96.5 kN dynamic load rating (C) and 96 kN static (C0), 4.65 kN fatigue load limit Cu, 61932 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2610 g (2.6 kg), 61932 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×220×28 mm envelope of 61932 gives a D/d ratio of 1.38 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 96.5/96 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2610 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6932ZZ on the 160×220×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61932 in a rated drive.", "Standard catalogue stock of 61932 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61932-ZZ-NTN bearing?", "a": "A 61932-ZZ-NTN deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 61932-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61932-ZZ-NTN need?", "a": "61932-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 61932?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6932ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×220×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6932ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61932-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61932-zz", "6932zz", "61932-ZZ", "6932ZZ", "61932-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16032-NTN", "brand": "NTN", "manufacturer_designation": "16032", "series": "16000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 109, "static_load_kN": 108, "fatigue_load_limit_kN": 5.1, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 3640, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 160 mm bore shares the 240 mm outside diameter of the 6032 but is only 25 mm wide; a 6032 in a 25 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "Storage matters for open bearings: 16032-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16032 units.", "Never mix components between two 16032-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16032 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 16032 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 16032; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 109 kN dynamic load rating (C) and 108 kN static (C0), 5.1 kN fatigue load limit Cu, 16032 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3640 g (3.6 kg), 16032 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×240×25 mm envelope of 16032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 109/108 kN load ratings, 5.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3640 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16032 on the 160×240×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16032 in a rated drive.", "Standard catalogue stock of 16032 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 16032-NTN bearing?", "a": "A 16032-NTN deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 25 mm width (6.299 × 9.449 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 16032-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 16032-NTN need?", "a": "The open 16032-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 16032?", "a": "NTN lists the open 16032 under the bare designation 16032; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "Does NTN offer 16032 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16032 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "16032", "equiv_brand": "FAG", "level": "full", "note": "Same 160×240×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16032", "16032-NTN" ], "locale_variants": {} }, { "sku": "6032-NTN", "brand": "NTN", "manufacturer_designation": "6032", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 144, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 5050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6032 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 160 mm of 6032-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 160 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6232 before committing to the smaller envelope.", "The open 6032-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 160×240×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6032 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6032-NTN.", "The open 6032 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 6032 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 6032; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 144 kN static (C0), 7.3 kN fatigue load limit Cu, 6032 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5050 g (5.0 kg), 6032 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 158/144 kN load ratings, 7.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6032 on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive.", "Standard catalogue stock of 6032 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6032-NTN bearing?", "a": "A 6032-NTN deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 160 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6032 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6032 uses the same ISO 15 envelope (160×240×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6032?", "a": "NTN lists the open 6032 under the bare designation 6032; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "Is 6032 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032", "equiv_brand": "SKF", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6032", "6032-NTN" ], "locale_variants": {} }, { "sku": "6032-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6032LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 144, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 5050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6032-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6032LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 160 mm of 6032-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6032-2RS-NTN runs slower and cooler-limited than the open 6032; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6032-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 160 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The housing bore for the 240 mm OD should be round within IT7; an oval bore pinches the outer ring of 6032-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6032LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 160 mm bore places 6032 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1600 r/min for 6032; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 144 kN static (C0), 7.3 kN fatigue load limit Cu, 6032 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5050 g (5.0 kg), 6032 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 158/144 kN load ratings, 7.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6032LLU on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive.", "Order the C3 internal-clearance version (6032 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6032-2RS-NTN bearing?", "a": "A 6032-2RS-NTN deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6032-2RS-NTN need?", "a": "6032-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6032 with a housing grease fitting instead." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6032?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6032LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×240×38 mm ISO 15 envelope." }, { "q": "Is 6032LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6032-llu", "6032llu", "6032-2RS", "6032-2rs", "6032LLU", "6032-2RS-NTN" ], "locale_variants": {} }, { "sku": "6032-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6032ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 144, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 5050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6032-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6032ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 160 mm of 6032-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 160 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6232 before committing to the smaller envelope.", "ZZ shields are non-contact: 6032-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6032-2RS for that.", "Do not wash 6032-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 6032-ZZ-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6032-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6032ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 160 mm bore places 6032 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 6032; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 144 kN static (C0), 7.3 kN fatigue load limit Cu, 6032 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5050 g (5.0 kg), 6032 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 158/144 kN load ratings, 7.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6032ZZ on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6032 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6032-ZZ-NTN bearing?", "a": "A 6032-ZZ-NTN deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6032-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6032-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6032 and verify the residual clearance after mounting." }, { "q": "How should 6032-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6032?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6032ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×240×38 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6032ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6032-zz", "6032zz", "6032-ZZ", "6032ZZ", "6032-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6232-NTN", "brand": "NTN", "manufacturer_designation": "6232", "series": "6200-series", "type": "deep_groove", "d_mm": 160, "D_mm": 290, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 205, "static_load_kN": 186, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 11700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6232 carries bore code 32 = 160 mm. Outside diameter 290 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 160 mm of 6232-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 160 mm bore; before upgrading to a 6332 for extra capacity, confirm the housing accepts a 290 mm OD and 48 mm width — it is not a drop-in swap.", "The open 6232-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 160×290×48 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6232-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 290 mm OD should be round within IT7; an oval bore pinches the outer ring of 6232-NTN and shows up later as two-point loaded raceway wear.", "A 160 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6232 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 6232 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2100 r/min for 6232; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 205 kN dynamic load rating (C) and 186 kN static (C0), 9.45 kN fatigue load limit Cu, 6232 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 11700 g (11.7 kg), 6232 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 160×290×48 mm envelope of 6232 gives a D/d ratio of 1.81 and 65.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 205/186 kN load ratings, 9.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 11700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6232 on the 160×290×48 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6232 in a rated drive.", "Order the C3 internal-clearance version (6232 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6232-NTN bearing?", "a": "A 6232-NTN deep-groove ball bearing has a 160 mm bore, 290 mm outer diameter and 48 mm width (6.299 × 11.417 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 160 mm bore?", "a": "The '2' is the light diameter series: 290×48 mm with a 65.0 mm radial section at 160 mm bore. A 6332 on the same bore is larger and higher-rated; a 6032 is smaller and lower-rated." }, { "q": "Are 6232 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6232 uses the same ISO 15 envelope (160×290×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6232?", "a": "NTN lists the open 6232 under the bare designation 6232; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "Does NTN offer 6232 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6232 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6232-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6232-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6232", "equiv_brand": "SKF", "level": "full", "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6232-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6232", "6232-NTN" ], "locale_variants": {} }, { "sku": "6332-NTN", "brand": "NTN", "manufacturer_designation": "6332", "series": "6300-series", "type": "deep_groove", "d_mm": 160, "D_mm": 340, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 310, "static_load_kN": 286, "fatigue_load_limit_kN": 14.2, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 26000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6332 carries bore code 32 = 160 mm. Outside diameter 340 mm and width 68 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 160 mm of 6332-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 160 mm bore gains dynamic rating through larger rolling elements on a 340 mm OD; the penalty is mass and a lower limiting speed than the 6232 — do not specify it for speed-critical shafts.", "The open 6332-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 160×340×68 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6332-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 68 mm-wide ring of 6332-NTN drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6332 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 6332 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1900 r/min for 6332; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6332 at 310 kN dynamic (C) and 286 kN static (C0), 14.2 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 26000 g (26.0 kg), 6332 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 160×340×68 mm envelope of 6332 gives a D/d ratio of 2.13 and 90.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 310/286 kN load ratings, 14.2 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 26000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6332 on the 160×340×68 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6332 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6332 is listed.", "Standard catalogue stock of 6332 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6332-NTN bearing?", "a": "A 6332-NTN deep-groove ball bearing has a 160 mm bore, 340 mm outer diameter and 68 mm width (6.299 × 13.386 × 2.677 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6332-NTN have?", "a": "Unless a clearance suffix says otherwise, 6332-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6332 and verify the residual clearance after mounting." }, { "q": "How should 6332-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6332?", "a": "NTN lists the open 6332 under the bare designation 6332; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "Does NTN offer 6332 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6332 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6332-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×340×68 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6332", "equiv_brand": "NSK", "level": "full", "note": "Same 160×340×68 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6332-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×340×68 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6332", "6332-NTN" ], "locale_variants": {} }, { "sku": "61834-NTN", "brand": "NTN", "manufacturer_designation": "6834", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66.5, "static_load_kN": 70.5, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 1630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61834 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 215 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 170 mm of 61834-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "The open 61834-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 170×215×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61834 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 61834-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61834-NTN-C3. No clearance suffix means normal CN clearance.", "The open 61834 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 61834 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2700 r/min for 61834; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61834 at 66.5 kN dynamic (C) and 70.5 kN static (C0), 3.35 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1630 g (1.6 kg), 61834 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 170×215×22 mm envelope of 61834 gives a D/d ratio of 1.26 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 66.5/70.5 kN load ratings, 3.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1630 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6834 on the 170×215×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61834 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61834 is listed." ], "faq": [ { "q": "What are the dimensions of a 61834-NTN bearing?", "a": "A 61834-NTN deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61834 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61834 uses the same ISO 15 envelope (170×215×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61834-NTN have?", "a": "Unless a clearance suffix says otherwise, 61834-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61834 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61834?", "a": "NTN lists the open 61834 under the bare designation 6834; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "What cage does NTN fit in 6834?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61834-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6834", "61834", "61834-NTN" ], "locale_variants": {} }, { "sku": "61834-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6834ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66.5, "static_load_kN": 70.5, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 1630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61834-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 215 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6834ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 170 mm of 61834-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "Do not wash 61834-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61834-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 170 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6834ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 170 mm bore places 61834 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2700 r/min for 61834; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61834 at 66.5 kN dynamic (C) and 70.5 kN static (C0), 3.35 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1630 g (1.6 kg), 61834 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 170×215×22 mm envelope of 61834 gives a D/d ratio of 1.26 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 66.5/70.5 kN load ratings, 3.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1630 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6834ZZ on the 170×215×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61834 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (61834 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61834-ZZ-NTN bearing?", "a": "A 61834-ZZ-NTN deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61834 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61834 uses the same ISO 15 envelope (170×215×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61834-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61834-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61834 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61834?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6834ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 170×215×22 mm ISO 15 envelope." }, { "q": "Is 6834ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61834-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61834-zz", "6834zz", "61834-ZZ", "6834ZZ", "61834-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61934-NTN", "brand": "NTN", "manufacturer_designation": "6934", "series": "61900-series", "type": "deep_groove", "d_mm": 170, "D_mm": 230, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 95, "static_load_kN": 95.5, "fatigue_load_limit_kN": 4.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 2740, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61934 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 230 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 170 mm bore the ring mass is significant: heat 61934 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (30.0 mm section height at 170 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61934-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 170×230×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61934-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 230 mm OD should be round within IT7; an oval bore pinches the outer ring of 61934-NTN and shows up later as two-point loaded raceway wear.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61934 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 61934 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 61934; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 95 kN dynamic load rating (C) and 95.5 kN static (C0), 4.5 kN fatigue load limit Cu, 61934 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2740 g (2.7 kg), 61934 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 170×230×28 mm envelope of 61934 gives a D/d ratio of 1.35 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 95/95.5 kN load ratings, 4.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2740 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6934 on the 170×230×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61934 in a rated drive.", "Order the C3 internal-clearance version (61934 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61934 is listed." ], "faq": [ { "q": "What are the dimensions of a 61934-NTN bearing?", "a": "A 61934-NTN deep-groove ball bearing has a 170 mm bore, 230 mm outer diameter and 28 mm width (6.693 × 9.055 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61934 mean?", "a": "A bare 61934 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 170 mm bore?", "a": "619 is a thin section one step above 618: 230×28 mm with a 30.0 mm radial section at 170 mm bore; a 6234 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN order number for an open 61934?", "a": "NTN lists the open 61934 under the bare designation 6934; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "What cage does NTN fit in 6934?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61934-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934", "equiv_brand": "NSK", "level": "full", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6934", "61934", "61934-NTN" ], "locale_variants": {} }, { "sku": "61934-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6934ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 170, "D_mm": 230, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 95, "static_load_kN": 95.5, "fatigue_load_limit_kN": 4.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 2740, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61934 carries bore code 34 = 170 mm. Outside diameter 230 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6934ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 170 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61934-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61934-2RS for that.", "Do not wash 61934-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 170 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6934ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 170 mm bore places 61934 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 61934; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 95 kN dynamic load rating (C) and 95.5 kN static (C0), 4.5 kN fatigue load limit Cu, 61934 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2740 g (2.7 kg), 61934 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 170×230×28 mm envelope of 61934 gives a D/d ratio of 1.35 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 95/95.5 kN load ratings, 4.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2740 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6934ZZ on the 170×230×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61934 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61934 is listed." ], "faq": [ { "q": "What are the dimensions of a 61934-ZZ-NTN bearing?", "a": "A 61934-ZZ-NTN deep-groove ball bearing has a 170 mm bore, 230 mm outer diameter and 28 mm width (6.693 × 9.055 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61900 compare with other series at the same 170 mm bore?", "a": "619 is a thin section one step above 618: 230×28 mm with a 30.0 mm radial section at 170 mm bore; a 6234 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61934 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61934 uses the same ISO 15 envelope (170×230×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61934?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6934ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 170×230×28 mm ISO 15 envelope." }, { "q": "Is 6934ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61934-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61934-zz", "6934zz", "61934-ZZ", "6934ZZ", "61934-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16034-NTN", "brand": "NTN", "manufacturer_designation": "16034", "series": "16000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 131, "static_load_kN": 128, "fatigue_load_limit_kN": 5.9, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 4930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16034 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 34 by five gives the 170 mm bore; the 260 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 170 mm of 16034-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 160xx narrow section at 170 mm bore shares the 260 mm outside diameter of the 6034 but is only 28 mm wide; a 6034 in a 28 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16034-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16034-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 16034-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 16034 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 16034 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 16034; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 131 kN dynamic load rating (C) and 128 kN static (C0), 5.9 kN fatigue load limit Cu, 16034 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4930 g (4.9 kg), 16034 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 170×260×28 mm envelope of 16034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 131/128 kN load ratings, 5.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4930 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16034 on the 170×260×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16034 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16034 is listed.", "Order the C3 internal-clearance version (16034 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16034-NTN bearing?", "a": "A 16034-NTN deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 28 mm width (6.693 × 10.236 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 16034 mean?", "a": "A bare 16034 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 170 mm bore?", "a": "160 is the narrow extra-light section: 260×28 mm with a 45.0 mm radial section at 170 mm bore. It has the same bore and outside diameter as the 6034 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN order number for an open 16034?", "a": "NTN lists the open 16034 under the bare designation 16034; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "What cage does NTN fit in 16034?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16034", "equiv_brand": "FAG", "level": "full", "note": "Same 170×260×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16034", "16034-NTN" ], "locale_variants": {} }, { "sku": "6034-NTN", "brand": "NTN", "manufacturer_designation": "6034", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 187, "static_load_kN": 172, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 6760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6034-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6034-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 170 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6034 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 6034 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 6034; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 187 kN dynamic load rating (C) and 172 kN static (C0), 8.55 kN fatigue load limit Cu, 6034 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 6760 g (6.8 kg), 6034 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 170×260×42 mm envelope of 6034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 187/172 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 6760 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6034 on the 170×260×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6034 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6034 is listed." ], "faq": [ { "q": "What are the dimensions of a 6034-NTN bearing?", "a": "A 6034-NTN deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6034-NTN have?", "a": "Unless a clearance suffix says otherwise, 6034-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6034 and verify the residual clearance after mounting." }, { "q": "How should 6034-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 170 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6034?", "a": "NTN lists the open 6034 under the bare designation 6034; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "Does NTN offer 6034 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6034 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6034-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-2RS", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6034", "6034-NTN" ], "locale_variants": {} }, { "sku": "6034-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6034ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 187, "static_load_kN": 172, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 6760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6034ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 170 mm of 6034-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6034-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6034-2RS for that.", "Do not wash 6034-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6034ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 170 mm bore places 6034 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 6034; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 187 kN dynamic load rating (C) and 172 kN static (C0), 8.55 kN fatigue load limit Cu, 6034 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 6760 g (6.8 kg), 6034 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 170×260×42 mm envelope of 6034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 187/172 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 6760 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6034ZZ on the 170×260×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6034 in a rated drive.", "Order the C3 internal-clearance version (6034 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6034-ZZ-NTN bearing?", "a": "A 6034-ZZ-NTN deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6034 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6034 uses the same ISO 15 envelope (170×260×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6034-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6034-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6034 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6034?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6034ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 170×260×42 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6034ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6034-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-2RS", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6034-zz", "6034zz", "6034-ZZ", "6034ZZ", "6034-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6234-NTN", "brand": "NTN", "manufacturer_designation": "6234", "series": "6200-series", "type": "deep_groove", "d_mm": 170, "D_mm": 310, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 235, "static_load_kN": 223, "fatigue_load_limit_kN": 11.1, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6234 carries bore code 34 = 170 mm. Outside diameter 310 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 170 mm bore the 62xx light series is the workhorse section; its 310×52 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6234-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 170×310×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6234 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 52 mm-wide ring of 6234-NTN drags the lip and overheats it.", "The open 6234 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 6234 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2000 r/min for 6234; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 235 kN dynamic load rating (C) and 223 kN static (C0), 11.1 kN fatigue load limit Cu, 6234 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 14500 g (14.5 kg), 6234 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 170×310×52 mm envelope of 6234 gives a D/d ratio of 1.82 and 70.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 235/223 kN load ratings, 11.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 14500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6234 on the 170×310×52 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6234 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 6234 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6234-NTN bearing?", "a": "A 6234-NTN deep-groove ball bearing has a 170 mm bore, 310 mm outer diameter and 52 mm width (6.693 × 12.205 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6234 bore code work?", "a": "The last two digits of 6234 are bore code 34, giving 34 × 5 = 170 mm bore. The 310 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6234 mean?", "a": "A bare 6234 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6234?", "a": "NTN lists the open 6234 under the bare designation 6234; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "Does NTN offer 6234 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6234 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6234-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6234-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6234", "equiv_brand": "SKF", "level": "full", "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6234-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6234", "6234-NTN" ], "locale_variants": {} }, { "sku": "6334-NTN", "brand": "NTN", "manufacturer_designation": "6334", "series": "6300-series", "type": "deep_groove", "d_mm": 170, "D_mm": 360, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 360, "static_load_kN": 355, "fatigue_load_limit_kN": 17, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 30700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6334 carries bore code 34 = 170 mm. Outside diameter 360 mm and width 72 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 170 mm bore the ring mass is significant: heat 6334 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 170 mm bore through a 360 mm OD and 72 mm width; the heavier rolling elements also trade away some speed versus a 6234.", "Storage matters for open bearings: 6334-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6334 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6334-NTN-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 72 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6334 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 6334 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1800 r/min for 6334; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6334 at 360 kN dynamic (C) and 355 kN static (C0), 17 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 30700 g (30.7 kg), 6334 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 170×360×72 mm envelope of 6334 gives a D/d ratio of 2.12 and 95.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 360/355 kN load ratings, 17 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 30700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6334 on the 170×360×72 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6334 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6334-NTN bearing?", "a": "A 6334-NTN deep-groove ball bearing has a 170 mm bore, 360 mm outer diameter and 72 mm width (6.693 × 14.173 × 2.835 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6334 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6334 uses the same ISO 15 envelope (170×360×72 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6334-NTN have?", "a": "Unless a clearance suffix says otherwise, 6334-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6334 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6334?", "a": "NTN lists the open 6334 under the bare designation 6334; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "Does NTN offer 6334 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6334 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6334-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 170×360×72 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6334", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×360×72 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6334-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×360×72 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6334", "6334-NTN" ], "locale_variants": {} }, { "sku": "61836-NTN", "brand": "NTN", "manufacturer_designation": "6836", "series": "61800-series", "type": "deep_groove", "d_mm": 180, "D_mm": 225, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 67, "static_load_kN": 73, "fatigue_load_limit_kN": 3.4, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 2030, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61836 carries bore code 36 = 180 mm. Outside diameter 225 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 180 mm bore the ring mass is significant: heat 61836 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 180 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6236.", "Storage matters for open bearings: 61836-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61836 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61836-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61836 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 61836 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 61836; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61836 at 67 kN dynamic (C) and 73 kN static (C0), 3.4 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 2030 g (2.0 kg), 61836 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 180×225×22 mm envelope of 61836 gives a D/d ratio of 1.25 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 67/73 kN load ratings, 3.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2030 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6836 on the 180×225×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61836 in a rated drive.", "Standard catalogue stock of 61836 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61836-NTN bearing?", "a": "A 61836-NTN deep-groove ball bearing has a 180 mm bore, 225 mm outer diameter and 22 mm width (7.087 × 8.858 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61836-NTN need?", "a": "The open 61836-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61836 bore code work?", "a": "The last two digits of 61836 are bore code 36, giving 36 × 5 = 180 mm bore. The 225 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61836?", "a": "NTN lists the open 61836 under the bare designation 6836; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "Is 6836 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61836-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61836-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61836-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61836", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6836", "61836", "61836-NTN" ], "locale_variants": {} }, { "sku": "61936-NTN", "brand": "NTN", "manufacturer_designation": "6936", "series": "61900-series", "type": "deep_groove", "d_mm": 180, "D_mm": 250, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 122, "static_load_kN": 119, "fatigue_load_limit_kN": 5.45, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 4760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61936 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 250 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 180 mm of 61936-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 180 mm bore (35.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61936-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 180×250×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61936-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 180 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61936 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 61936 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 61936; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 122 kN dynamic load rating (C) and 119 kN static (C0), 5.45 kN fatigue load limit Cu, 61936 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4760 g (4.8 kg), 61936 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 180×250×33 mm envelope of 61936 gives a D/d ratio of 1.39 and only 35.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 122/119 kN load ratings, 5.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4760 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6936 on the 180×250×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61936 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 61936 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61936-NTN bearing?", "a": "A 61936-NTN deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 180 mm bore?", "a": "619 is a thin section one step above 618: 250×33 mm with a 35.0 mm radial section at 180 mm bore; a 6236 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61936 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61936 uses the same ISO 15 envelope (180×250×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61936?", "a": "NTN lists the open 61936 under the bare designation 6936; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "Is 6936 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61936-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61936-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61936-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61936", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61936-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6936", "61936", "61936-NTN" ], "locale_variants": {} }, { "sku": "16036-NTN", "brand": "NTN", "manufacturer_designation": "16036", "series": "16000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 129, "static_load_kN": 134, "fatigue_load_limit_kN": 5.85, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 6490, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16036 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 36 by five gives the 180 mm bore; the 280 mm outside diameter and 31 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Because the 160xx narrow section shares the 280 mm OD of the 6036 at 180 mm bore but is only 31 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16036-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 180×280×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16036-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16036 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 16036 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 16036; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 129 kN dynamic load rating (C) and 134 kN static (C0), 5.85 kN fatigue load limit Cu, 16036 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 6490 g (6.5 kg), 16036 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 180×280×31 mm envelope of 16036 gives a D/d ratio of 1.56 and 50.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 129/134 kN load ratings, 5.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 6490 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16036 on the 180×280×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16036 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 16036 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16036-NTN bearing?", "a": "A 16036-NTN deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 31 mm width (7.087 × 11.024 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 16036-NTN have?", "a": "Unless a clearance suffix says otherwise, 16036-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16036 and verify the residual clearance after mounting." }, { "q": "How should 16036-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 16036?", "a": "NTN lists the open 16036 under the bare designation 16036; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "What cage does NTN fit in 16036?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16036", "equiv_brand": "FAG", "level": "full", "note": "Same 180×280×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16036", "16036-NTN" ], "locale_variants": {} }, { "sku": "6036-NTN", "brand": "NTN", "manufacturer_designation": "6036", "series": "6000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 210, "static_load_kN": 199, "fatigue_load_limit_kN": 9.7, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 8800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 180 mm of 6036-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 180 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6236 before committing to the smaller envelope.", "Storage matters for open bearings: 6036-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6036 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 46 mm-wide ring of 6036-NTN drags the lip and overheats it.", "Never mix components between two 6036-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6036 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 6036 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 6036; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 210 kN dynamic load rating (C) and 199 kN static (C0), 9.7 kN fatigue load limit Cu, 6036 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8800 g (8.8 kg), 6036 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 180×280×46 mm envelope of 6036 gives a D/d ratio of 1.56 and 50.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 210/199 kN load ratings, 9.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6036 on the 180×280×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6036 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6036 is listed." ], "faq": [ { "q": "What are the dimensions of a 6036-NTN bearing?", "a": "A 6036-NTN deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6036-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6036-NTN need?", "a": "The open 6036-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6036?", "a": "NTN lists the open 6036 under the bare designation 6036; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "Is 6036 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6036-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6036-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6036-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6036", "equiv_brand": "SKF", "level": "full", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6036-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6036", "6036-NTN" ], "locale_variants": {} }, { "sku": "6236-NTN", "brand": "NTN", "manufacturer_designation": "6236", "series": "6200-series", "type": "deep_groove", "d_mm": 180, "D_mm": 320, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 252, "static_load_kN": 241, "fatigue_load_limit_kN": 11.9, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 15100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6236 carries bore code 36 = 180 mm. Outside diameter 320 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 180 mm of 6236-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 180 mm bore the 62xx light series is the workhorse section; its 320×52 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6236-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 180×320×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6236 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 52 mm-wide ring of 6236-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6236-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6236 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 6236 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1900 r/min for 6236; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6236 at 252 kN dynamic (C) and 241 kN static (C0), 11.9 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 15100 g (15.1 kg), 6236 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 180×320×52 mm envelope of 6236 gives a D/d ratio of 1.78 and 70.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 252/241 kN load ratings, 11.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 15100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6236 on the 180×320×52 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6236 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6236 is listed.", "Order the C3 internal-clearance version (6236 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6236-NTN bearing?", "a": "A 6236-NTN deep-groove ball bearing has a 180 mm bore, 320 mm outer diameter and 52 mm width (7.087 × 12.598 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6236 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6236 uses the same ISO 15 envelope (180×320×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6236-NTN have?", "a": "Unless a clearance suffix says otherwise, 6236-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6236 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6236?", "a": "NTN lists the open 6236 under the bare designation 6236; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "Does NTN offer 6236 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6236 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6236-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6236-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6236", "equiv_brand": "SKF", "level": "full", "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6236-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6236", "6236-NTN" ], "locale_variants": {} }, { "sku": "6336-NTN", "brand": "NTN", "manufacturer_designation": "6336", "series": "6300-series", "type": "deep_groove", "d_mm": 180, "D_mm": 380, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 390, "static_load_kN": 405, "fatigue_load_limit_kN": 19, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 35600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6336 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 380 mm outside diameter and 75 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 180 mm bore the ring mass is significant: heat 6336 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 180 mm bore through a 380 mm OD and 75 mm width; the heavier rolling elements also trade away some speed versus a 6236.", "The open 6336-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 180×380×75 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6336 units.", "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6336 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 6336 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1700 r/min for 6336; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6336 at 390 kN dynamic (C) and 405 kN static (C0), 19 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 35600 g (35.6 kg), 6336 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 180×380×75 mm envelope of 6336 gives a D/d ratio of 2.11 and 100.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 390/405 kN load ratings, 19 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 35600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6336 on the 180×380×75 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6336 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6336-NTN bearing?", "a": "A 6336-NTN deep-groove ball bearing has a 180 mm bore, 380 mm outer diameter and 75 mm width (7.087 × 14.961 × 2.953 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6336 mean?", "a": "A bare 6336 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 180 mm bore?", "a": "The '3' is the medium diameter series: 380×75 mm, 100.0 mm radial section at 180 mm bore, carrying more load than a 6236 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN order number for an open 6336?", "a": "NTN lists the open 6336 under the bare designation 6336; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "Does NTN offer 6336 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6336 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6336-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 180×380×75 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6336", "equiv_brand": "SKF", "level": "full", "note": "Same 180×380×75 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6336-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×380×75 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6336", "6336-NTN" ], "locale_variants": {} }, { "sku": "61838-NTN", "brand": "NTN", "manufacturer_designation": "6838", "series": "61800-series", "type": "deep_groove", "d_mm": 190, "D_mm": 240, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 81, "static_load_kN": 88, "fatigue_load_limit_kN": 4, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 2620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61838 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 240 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 190 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6238.", "The open 61838-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 190×240×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61838 units.", "Measure the shaft, do not trust the drawing: a 190 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61838-NTN.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 61838-NTN drags the lip and overheats it.", "The open 61838 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 61838 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 61838; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 81 kN dynamic load rating (C) and 88 kN static (C0), 4 kN fatigue load limit Cu, 61838 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2620 g (2.6 kg), 61838 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 190×240×24 mm envelope of 61838 gives a D/d ratio of 1.26 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 81/88 kN load ratings, 4 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6838 on the 190×240×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61838 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61838 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61838-NTN bearing?", "a": "A 61838-NTN deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61838 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61838 uses the same ISO 15 envelope (190×240×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61838-NTN have?", "a": "Unless a clearance suffix says otherwise, 61838-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61838 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61838?", "a": "NTN lists the open 61838 under the bare designation 6838; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "Is 6838 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61838-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61838-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61838-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61838", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6838", "61838", "61838-NTN" ], "locale_variants": {} }, { "sku": "61938-NTN", "brand": "NTN", "manufacturer_designation": "6938", "series": "61900-series", "type": "deep_groove", "d_mm": 190, "D_mm": 260, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 127, "fatigue_load_limit_kN": 5.65, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 4980, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61938 carries bore code 38 = 190 mm. Outside diameter 260 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 190 mm bore (35.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61938-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61938 units.", "The housing bore for the 260 mm OD should be round within IT7; an oval bore pinches the outer ring of 61938-NTN and shows up later as two-point loaded raceway wear.", "A 190 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61938 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 61938 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 61938; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 125 kN dynamic load rating (C) and 127 kN static (C0), 5.65 kN fatigue load limit Cu, 61938 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4980 g (5.0 kg), 61938 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 190×260×33 mm envelope of 61938 gives a D/d ratio of 1.37 and only 35.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 125/127 kN load ratings, 5.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4980 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6938 on the 190×260×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61938 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61938 is listed.", "Standard catalogue stock of 61938 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61938-NTN bearing?", "a": "A 61938-NTN deep-groove ball bearing has a 190 mm bore, 260 mm outer diameter and 33 mm width (7.48 × 10.236 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 190 mm bore?", "a": "619 is a thin section one step above 618: 260×33 mm with a 35.0 mm radial section at 190 mm bore; a 6238 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61938 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61938 uses the same ISO 15 envelope (190×260×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61938?", "a": "NTN lists the open 61938 under the bare designation 6938; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "Does NTN offer 61938 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6938 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61938-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61938-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61938", "equiv_brand": "SKF", "level": "full", "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61938-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6938", "61938", "61938-NTN" ], "locale_variants": {} }, { "sku": "16038-NTN", "brand": "NTN", "manufacturer_designation": "16038", "series": "16000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 149, "static_load_kN": 156, "fatigue_load_limit_kN": 6.7, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 6770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16038 carries bore code 38 = 190 mm. Outside diameter 290 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 190 mm of 16038-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Because the 160xx narrow section shares the 290 mm OD of the 6038 at 190 mm bore but is only 31 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16038-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 190×290×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16038-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 290 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16038-NTN.", "Vibration during standstill brinells the raceways of a 190 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 16038 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 16038 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2100 r/min for 16038; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 149 kN dynamic load rating (C) and 156 kN static (C0), 6.7 kN fatigue load limit Cu, 16038 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 6770 g (6.8 kg), 16038 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 190×290×31 mm envelope of 16038 gives a D/d ratio of 1.53 and 50.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 149/156 kN load ratings, 6.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 6770 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16038 on the 190×290×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16038 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (16038 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16038-NTN bearing?", "a": "A 16038-NTN deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 31 mm width (7.48 × 11.417 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 16038 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16038 uses the same ISO 15 envelope (190×290×31 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 16038-NTN have?", "a": "Unless a clearance suffix says otherwise, 16038-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16038 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 16038?", "a": "NTN lists the open 16038 under the bare designation 16038; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "Does NTN offer 16038 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16038 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "16038", "equiv_brand": "FAG", "level": "full", "note": "Same 190×290×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16038", "16038-NTN" ], "locale_variants": {} }, { "sku": "6038-NTN", "brand": "NTN", "manufacturer_designation": "6038", "series": "6000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 218, "static_load_kN": 215, "fatigue_load_limit_kN": 10.1, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 9180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6038 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 290 mm outside diameter and 46 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 190 mm bore the ring mass is significant: heat 6038 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 190 mm bore uses a smaller 290 mm OD than a 6238; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6038-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 190×290×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6038-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The housing bore for the 290 mm OD should be round within IT7; an oval bore pinches the outer ring of 6038-NTN and shows up later as two-point loaded raceway wear.", "The open 6038 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 6038 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2100 r/min for 6038; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 218 kN dynamic load rating (C) and 215 kN static (C0), 10.1 kN fatigue load limit Cu, 6038 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9180 g (9.2 kg), 6038 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 190×290×46 mm envelope of 6038 gives a D/d ratio of 1.53 and 50.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 218/215 kN load ratings, 10.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6038 on the 190×290×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6038 in a rated drive.", "Order the C3 internal-clearance version (6038 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6038-NTN bearing?", "a": "A 6038-NTN deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 46 mm width (7.48 × 11.417 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6038 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6038 uses the same ISO 15 envelope (190×290×46 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6038-NTN have?", "a": "Unless a clearance suffix says otherwise, 6038-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6038 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6038?", "a": "NTN lists the open 6038 under the bare designation 6038; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "What cage does NTN fit in 6038?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6038-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6038-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6038", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6038-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6038", "6038-NTN" ], "locale_variants": {} }, { "sku": "6238-NTN", "brand": "NTN", "manufacturer_designation": "6238", "series": "6200-series", "type": "deep_groove", "d_mm": 190, "D_mm": 340, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 282, "static_load_kN": 281, "fatigue_load_limit_kN": 13.5, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 18200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6238 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 340 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 190 mm bore the ring mass is significant: heat 6238 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 190 mm bore; before upgrading to a 6338 for extra capacity, confirm the housing accepts a 340 mm OD and 55 mm width — it is not a drop-in swap.", "The open 6238-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 190×340×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6238-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 340 mm OD should be round within IT7; an oval bore pinches the outer ring of 6238-NTN and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 340 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6238-NTN.", "The open 6238 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 6238 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1800 r/min for 6238; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6238 at 282 kN dynamic (C) and 281 kN static (C0), 13.5 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 18200 g (18.2 kg), 6238 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 190×340×55 mm envelope of 6238 gives a D/d ratio of 1.79 and 75.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 282/281 kN load ratings, 13.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 18200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6238 on the 190×340×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6238 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6238 is listed.", "Standard catalogue stock of 6238 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6238-NTN bearing?", "a": "A 6238-NTN deep-groove ball bearing has a 190 mm bore, 340 mm outer diameter and 55 mm width (7.48 × 13.386 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6238 bore code work?", "a": "The last two digits of 6238 are bore code 38, giving 38 × 5 = 190 mm bore. The 340 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6238 mean?", "a": "A bare 6238 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6238?", "a": "NTN lists the open 6238 under the bare designation 6238; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "Does NTN offer 6238 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6238 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6238-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6238-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6238", "equiv_brand": "SKF", "level": "full", "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6238-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6238", "6238-NTN" ], "locale_variants": {} }, { "sku": "6338-NTN", "brand": "NTN", "manufacturer_designation": "6338", "series": "6300-series", "type": "deep_groove", "d_mm": 190, "D_mm": 400, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 395, "static_load_kN": 415, "fatigue_load_limit_kN": 18.9, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 41000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6338 carries bore code 38 = 190 mm. Outside diameter 400 mm and width 78 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 190 mm bore through a 400 mm OD and 78 mm width; the heavier rolling elements also trade away some speed versus a 6238.", "The open 6338-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 190×400×78 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6338 units.", "Measure the shaft, do not trust the drawing: a 190 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6338-NTN.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 78 mm-wide ring of 6338-NTN drags the lip and overheats it.", "The open 6338 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 6338 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1600 r/min for 6338; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6338 at 395 kN dynamic (C) and 415 kN static (C0), 18.9 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 41000 g (41.0 kg), 6338 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 190×400×78 mm envelope of 6338 gives a D/d ratio of 2.11 and 105.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 395/415 kN load ratings, 18.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 41000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6338 on the 190×400×78 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6338 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6338 is listed." ], "faq": [ { "q": "What are the dimensions of a 6338-NTN bearing?", "a": "A 6338-NTN deep-groove ball bearing has a 190 mm bore, 400 mm outer diameter and 78 mm width (7.48 × 15.748 × 3.071 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6338 bore code work?", "a": "The last two digits of 6338 are bore code 38, giving 38 × 5 = 190 mm bore. The 400 mm outside diameter and 78 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6338 mean?", "a": "A bare 6338 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6338?", "a": "NTN lists the open 6338 under the bare designation 6338; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "Is 6338 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6338-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 190×400×78 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6338", "equiv_brand": "SKF", "level": "full", "note": "Same 190×400×78 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6338-M", "equiv_brand": "SKF", "level": "full", "note": "Same 190×400×78 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6338", "6338-NTN" ], "locale_variants": {} }, { "sku": "61840-NTN", "brand": "NTN", "manufacturer_designation": "6840", "series": "61800-series", "type": "deep_groove", "d_mm": 200, "D_mm": 250, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 82, "static_load_kN": 91.5, "fatigue_load_limit_kN": 4.05, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 2730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61840 carries bore code 40 = 200 mm. Outside diameter 250 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 25.0 mm of radial section separates bore and OD on the 618xx series at 200 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6240.", "The open 61840-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 200×250×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61840-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 250 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61840-NTN.", "The open 61840 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 61840 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 61840; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 82 kN dynamic load rating (C) and 91.5 kN static (C0), 4.05 kN fatigue load limit Cu, 61840 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2730 g (2.7 kg), 61840 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 200×250×24 mm envelope of 61840 gives a D/d ratio of 1.25 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 82/91.5 kN load ratings, 4.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2730 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6840 on the 200×250×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61840 in a rated drive.", "Standard catalogue stock of 61840 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61840-NTN bearing?", "a": "A 61840-NTN deep-groove ball bearing has a 200 mm bore, 250 mm outer diameter and 24 mm width (7.874 × 9.843 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61840-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61840-NTN need?", "a": "The open 61840-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61840?", "a": "NTN lists the open 61840 under the bare designation 6840; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "Is 6840 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61840-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61840-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61840", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6840", "61840", "61840-NTN" ], "locale_variants": {} }, { "sku": "61940-NTN", "brand": "NTN", "manufacturer_designation": "6940", "series": "61900-series", "type": "deep_groove", "d_mm": 200, "D_mm": 280, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 174, "static_load_kN": 168, "fatigue_load_limit_kN": 7.45, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 7100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61940 carries bore code 40 = 200 mm. Outside diameter 280 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 200 mm bore the ring mass is significant: heat 61940 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (40.0 mm section height at 200 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61940-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61940 units.", "Never mix components between two 61940-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61940 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 61940 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2200 r/min for 61940; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 174 kN dynamic load rating (C) and 168 kN static (C0), 7.45 kN fatigue load limit Cu, 61940 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7100 g (7.1 kg), 61940 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 200×280×38 mm envelope of 61940 gives a D/d ratio of 1.40 and 40.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 174/168 kN load ratings, 7.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 2200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6940 on the 200×280×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61940 in a rated drive.", "Standard catalogue stock of 61940 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61940 is listed." ], "faq": [ { "q": "What are the dimensions of a 61940-NTN bearing?", "a": "A 61940-NTN deep-groove ball bearing has a 200 mm bore, 280 mm outer diameter and 38 mm width (7.874 × 11.024 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 200 mm bore?", "a": "619 is a thin section one step above 618: 280×38 mm with a 40.0 mm radial section at 200 mm bore; a 6240 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61940 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61940 uses the same ISO 15 envelope (200×280×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61940?", "a": "NTN lists the open 61940 under the bare designation 6940; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "Does NTN offer 61940 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6940 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61940-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61940-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61940-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61940", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61940-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6940", "61940", "61940-NTN" ], "locale_variants": {} }, { "sku": "16040-NTN", "brand": "NTN", "manufacturer_designation": "16040", "series": "16000-series", "type": "deep_groove", "d_mm": 200, "D_mm": 310, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 157, "static_load_kN": 160, "fatigue_load_limit_kN": 6.65, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 8680, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16040 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 40 by five gives the 200 mm bore; the 310 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 200 mm bore the ring mass is significant: heat 16040 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Because the 160xx narrow section shares the 310 mm OD of the 6040 at 200 mm bore but is only 34 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16040-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 200×310×34 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16040-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 200 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 16040-NTN.", "The open 16040 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 16040 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2000 r/min for 16040; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 157 kN dynamic load rating (C) and 160 kN static (C0), 6.65 kN fatigue load limit Cu, 16040 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8680 g (8.7 kg), 16040 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 200×310×34 mm envelope of 16040 gives a D/d ratio of 1.55 and 55.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 157/160 kN load ratings, 6.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8680 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16040 on the 200×310×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16040 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16040 is listed.", "Order the C3 internal-clearance version (16040 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16040-NTN bearing?", "a": "A 16040-NTN deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 34 mm width (7.874 × 12.205 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 200 mm bore?", "a": "160 is the narrow extra-light section: 310×34 mm with a 55.0 mm radial section at 200 mm bore. It has the same bore and outside diameter as the 6040 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16040 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16040 uses the same ISO 15 envelope (200×310×34 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16040?", "a": "NTN lists the open 16040 under the bare designation 16040; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "What cage does NTN fit in 16040?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16040", "equiv_brand": "FAG", "level": "partial", "note": "Same 200×310×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16040", "16040-NTN" ], "locale_variants": {} }, { "sku": "6040-NTN", "brand": "NTN", "manufacturer_designation": "6040", "series": "6000-series", "type": "deep_groove", "d_mm": 200, "D_mm": 310, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 241, "static_load_kN": 243, "fatigue_load_limit_kN": 11.2, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 11900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6040 carries bore code 40 = 200 mm. Outside diameter 310 mm and width 51 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 200 mm of 6040-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 200 mm bore uses a smaller 310 mm OD than a 6240; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6040-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 200×310×51 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6040 units.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6040 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 6040 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2000 r/min for 6040; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 241 kN dynamic load rating (C) and 243 kN static (C0), 11.2 kN fatigue load limit Cu, 6040 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 11900 g (11.9 kg), 6040 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 200×310×51 mm envelope of 6040 gives a D/d ratio of 1.55 and 55.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 241/243 kN load ratings, 11.2 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 11900 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6040 on the 200×310×51 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6040 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6040-NTN bearing?", "a": "A 6040-NTN deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 51 mm width (7.874 × 12.205 × 2.008 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6040 mean?", "a": "A bare 6040 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 200 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (310×51 mm, 55.0 mm radial section) at 200 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN order number for an open 6040?", "a": "NTN lists the open 6040 under the bare designation 6040; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "What cage does NTN fit in 6040?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6040-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×310×51 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6040", "equiv_brand": "NSK", "level": "full", "note": "Same 200×310×51 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6040-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×310×51 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6040", "6040-NTN" ], "locale_variants": {} }, { "sku": "6240-NTN", "brand": "NTN", "manufacturer_designation": "6240", "series": "6200-series", "type": "deep_groove", "d_mm": 200, "D_mm": 360, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 298, "static_load_kN": 310, "fatigue_load_limit_kN": 14.4, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 21600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6240 carries bore code 40 = 200 mm. Outside diameter 360 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 200 mm of 6240-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 200 mm bore the 62xx light series is the workhorse section; its 360×58 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6240-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 200×360×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6240 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6240 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 6240 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1700 r/min for 6240; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6240 at 298 kN dynamic (C) and 310 kN static (C0), 14.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 21600 g (21.6 kg), 6240 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 200×360×58 mm envelope of 6240 gives a D/d ratio of 1.80 and 80.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 298/310 kN load ratings, 14.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 21600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6240 on the 200×360×58 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6240 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6240 is listed." ], "faq": [ { "q": "What are the dimensions of a 6240-NTN bearing?", "a": "A 6240-NTN deep-groove ball bearing has a 200 mm bore, 360 mm outer diameter and 58 mm width (7.874 × 14.173 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6240 mean?", "a": "A bare 6240 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 200 mm bore?", "a": "The '2' is the light diameter series: 360×58 mm with a 80.0 mm radial section at 200 mm bore. A 6340 on the same bore is larger and higher-rated; a 6040 is smaller and lower-rated." }, { "q": "What is the NTN order number for an open 6240?", "a": "NTN lists the open 6240 under the bare designation 6240; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "Does NTN offer 6240 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6240 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6240-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6240-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6240", "equiv_brand": "SKF", "level": "full", "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6240-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6240", "6240-NTN" ], "locale_variants": {} }, { "sku": "6340-NTN", "brand": "NTN", "manufacturer_designation": "6340", "series": "6300-series", "type": "deep_groove", "d_mm": 200, "D_mm": 420, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 455, "static_load_kN": 500, "fatigue_load_limit_kN": 22.3, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 46300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6340 carries bore code 40 = 200 mm. Outside diameter 420 mm and width 80 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 200 mm of 6340-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 200 mm bore gains dynamic rating through larger rolling elements on a 420 mm OD; the penalty is mass and a lower limiting speed than the 6240 — do not specify it for speed-critical shafts.", "The open 6340-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 200×420×80 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6340 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 420 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6340-NTN.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6340 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 6340 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1500 r/min for 6340; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 455 kN dynamic load rating (C) and 500 kN static (C0), 22.3 kN fatigue load limit Cu, 6340 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 46300 g (46.3 kg), 6340 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 200×420×80 mm envelope of 6340 gives a D/d ratio of 2.10 and 110.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 455/500 kN load ratings, 22.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 46300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6340 on the 200×420×80 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6340 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6340 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6340-NTN bearing?", "a": "A 6340-NTN deep-groove ball bearing has a 200 mm bore, 420 mm outer diameter and 80 mm width (7.874 × 16.535 × 3.15 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6340-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6340-NTN need?", "a": "The open 6340-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6340?", "a": "NTN lists the open 6340 under the bare designation 6340; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "What cage does NTN fit in 6340?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6340", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×420×80 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6340", "6340-NTN" ], "locale_variants": {} }, { "sku": "61844-NTN", "brand": "NTN", "manufacturer_designation": "6844", "series": "61800-series", "type": "deep_groove", "d_mm": 220, "D_mm": 270, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 84.5, "static_load_kN": 98, "fatigue_load_limit_kN": 4.15, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 3000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61844 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 44 by five gives the 220 mm bore; the 270 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 220 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 220 mm of 61844-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 220 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6244.", "The open 61844-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 220×270×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61844 units.", "A 220 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 270 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61844-NTN.", "The open 61844 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 61844 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 2100 r/min for 61844; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 84.5 kN dynamic load rating (C) and 98 kN static (C0), 4.15 kN fatigue load limit Cu, 61844 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3000 g (3.0 kg), 61844 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 220×270×24 mm envelope of 61844 gives a D/d ratio of 1.23 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 84.5/98 kN load ratings, 4.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6844 on the 220×270×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61844 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61844 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61844-NTN bearing?", "a": "A 61844-NTN deep-groove ball bearing has a 220 mm bore, 270 mm outer diameter and 24 mm width (8.661 × 10.63 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61844-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 220 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61844-NTN need?", "a": "The open 61844-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61844?", "a": "NTN lists the open 61844 under the bare designation 6844; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "Does NTN offer 61844 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6844 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61844-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61844-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61844-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61844", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6844", "61844", "61844-NTN" ], "locale_variants": {} }, { "sku": "61944-NTN", "brand": "NTN", "manufacturer_designation": "6944", "series": "61900-series", "type": "deep_groove", "d_mm": 220, "D_mm": 300, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 178, "static_load_kN": 180, "fatigue_load_limit_kN": 7.55, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 7690, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61944 carries bore code 44 = 220 mm. Outside diameter 300 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 220 mm of 61944-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (40.0 mm section height at 220 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61944-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 220×300×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61944 units.", "Vibration during standstill brinells the raceways of a 220 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61944 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 61944 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 2000 r/min for 61944; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 178 kN dynamic load rating (C) and 180 kN static (C0), 7.55 kN fatigue load limit Cu, 61944 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7690 g (7.7 kg), 61944 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 220×300×38 mm envelope of 61944 gives a D/d ratio of 1.36 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 178/180 kN load ratings, 7.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7690 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6944 on the 220×300×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61944 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61944 is listed.", "Order the C3 internal-clearance version (61944 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61944-NTN bearing?", "a": "A 61944-NTN deep-groove ball bearing has a 220 mm bore, 300 mm outer diameter and 38 mm width (8.661 × 11.811 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61944-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 220 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61944-NTN need?", "a": "The open 61944-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61944?", "a": "NTN lists the open 61944 under the bare designation 6944; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "Does NTN offer 61944 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6944 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61944-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61944-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61944-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61944", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61944-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6944", "61944", "61944-NTN" ], "locale_variants": {} }, { "sku": "16044", "brand": "NTN", "manufacturer_designation": "16044", "series": "16000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 200, "static_load_kN": 216, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 11300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Because the 160xx narrow section shares the 340 mm OD of the 6044 at 220 mm bore but is only 37 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "Storage matters for open bearings: 16044 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16044 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16044-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 16044 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 16044 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1800 r/min for 16044; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 200 kN dynamic load rating (C) and 216 kN static (C0), 8.65 kN fatigue load limit Cu, 16044 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 11300 g (11.3 kg), 16044 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 220×340×37 mm envelope of 16044 gives a D/d ratio of 1.55 and 60.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 200/216 kN load ratings, 8.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 11300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16044 on the 220×340×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16044 in a rated drive.", "Standard catalogue stock of 16044 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 16044 bearing?", "a": "A 16044 deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 37 mm width (8.661 × 13.386 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16044 bore code work?", "a": "The last two digits of 16044 are bore code 44, giving 44 × 5 = 220 mm bore. The 340 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16044 mean?", "a": "A bare 16044 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 16044?", "a": "NTN lists the open 16044 under the bare designation 16044; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "Does NTN offer 16044 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16044 is the correct choice." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16044" ], "locale_variants": {} }, { "sku": "6044-NTN", "brand": "NTN", "manufacturer_designation": "6044", "series": "6000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 267, "static_load_kN": 289, "fatigue_load_limit_kN": 12.5, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 15700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 220 mm bore the ring mass is significant: heat 6044 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 220 mm bore uses a smaller 340 mm OD than a 6244; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6044-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6044 units.", "Vibration during standstill brinells the raceways of a 220 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 56 mm-wide ring of 6044-NTN drags the lip and overheats it.", "The open 6044 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 6044 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1800 r/min for 6044; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6044 at 267 kN dynamic (C) and 289 kN static (C0), 12.5 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 15700 g (15.7 kg), 6044 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 220×340×56 mm envelope of 6044 gives a D/d ratio of 1.55 and 60.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 267/289 kN load ratings, 12.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 15700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6044 on the 220×340×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6044 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6044-NTN bearing?", "a": "A 6044-NTN deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 56 mm width (8.661 × 13.386 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 220 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (340×56 mm, 60.0 mm radial section) at 220 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6044 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6044 uses the same ISO 15 envelope (220×340×56 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6044?", "a": "NTN lists the open 6044 under the bare designation 6044; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "What cage does NTN fit in 6044?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6044-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6044-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6044", "equiv_brand": "SKF", "level": "full", "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6044-M", "equiv_brand": "SKF", "level": "full", "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6044", "6044-NTN" ], "locale_variants": {} }, { "sku": "6244-NTN", "brand": "NTN", "manufacturer_designation": "6244", "series": "6200-series", "type": "deep_groove", "d_mm": 220, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 330, "static_load_kN": 365, "fatigue_load_limit_kN": 15.8, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 30200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6244 carries bore code 44 = 220 mm. Outside diameter 400 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 220 mm of 6244-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 220 mm bore the 62xx light series is the workhorse section; its 400×65 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6244-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 220×400×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6244 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6244-NTN-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 65 mm-wide ring of 6244-NTN drags the lip and overheats it.", "The open 6244 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 6244 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1500 r/min for 6244; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6244 at 330 kN dynamic (C) and 365 kN static (C0), 15.8 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 30200 g (30.2 kg), 6244 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 220×400×65 mm envelope of 6244 gives a D/d ratio of 1.82 and 90.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 330/365 kN load ratings, 15.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 30200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6244 on the 220×400×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6244 in a rated drive.", "Standard catalogue stock of 6244 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6244 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6244-NTN bearing?", "a": "A 6244-NTN deep-groove ball bearing has a 220 mm bore, 400 mm outer diameter and 65 mm width (8.661 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6244-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 220 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6244-NTN need?", "a": "The open 6244-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6244?", "a": "NTN lists the open 6244 under the bare designation 6244; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "Does NTN offer 6244 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6244 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6244-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 220×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6244", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6244-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6244", "6244-NTN" ], "locale_variants": {} }, { "sku": "6344-NTN", "brand": "NTN", "manufacturer_designation": "6344", "series": "6300-series", "type": "deep_groove", "d_mm": 220, "D_mm": 460, "B_mm": 88, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 455, "static_load_kN": 520, "fatigue_load_limit_kN": 22, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 60800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6344 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 44 by five gives the 220 mm bore; the 460 mm outside diameter and 88 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 220 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 220 mm bore through a 460 mm OD and 88 mm width; the heavier rolling elements also trade away some speed versus a 6244.", "The open 6344-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 220×460×88 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6344-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 220 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 460 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6344-NTN.", "The open 6344 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 6344 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1400 r/min for 6344; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 455 kN dynamic load rating (C) and 520 kN static (C0), 22 kN fatigue load limit Cu, 6344 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 60800 g (60.8 kg), 6344 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 220×460×88 mm envelope of 6344 gives a D/d ratio of 2.09 and 120.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 455/520 kN load ratings, 22 kN fatigue load limit Cu NTN lists the grease limiting speed at 1400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 60800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6344 on the 220×460×88 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6344 in a rated drive.", "Standard catalogue stock of 6344 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6344 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6344-NTN bearing?", "a": "A 6344-NTN deep-groove ball bearing has a 220 mm bore, 460 mm outer diameter and 88 mm width (8.661 × 18.11 × 3.465 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6344 bore code work?", "a": "The last two digits of 6344 are bore code 44, giving 44 × 5 = 220 mm bore. The 460 mm outside diameter and 88 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6344 mean?", "a": "A bare 6344 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6344?", "a": "NTN lists the open 6344 under the bare designation 6344; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "Is 6344 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6344", "equiv_brand": "NSK", "level": "full", "note": "Same 220×460×88 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6344-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×460×88 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6344", "6344-NTN" ], "locale_variants": {} }, { "sku": "61848-NTN", "brand": "NTN", "manufacturer_designation": "6848", "series": "61800-series", "type": "deep_groove", "d_mm": 240, "D_mm": 300, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 112, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 4600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61848 carries bore code 48 = 240 mm. Outside diameter 300 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 240 mm bore has only a 30.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6248.", "The open 61848-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 240×300×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61848-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61848-NTN-C3. No clearance suffix means normal CN clearance.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61848 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 240 mm bore places 61848 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1900 r/min for 61848; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 112 kN static (C0), 4.55 kN fatigue load limit Cu, 61848 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4600 g (4.6 kg), 61848 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 240×300×28 mm envelope of 61848 gives a D/d ratio of 1.25 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 94/112 kN load ratings, 4.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6848 on the 240×300×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61848 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61848-NTN bearing?", "a": "A 61848-NTN deep-groove ball bearing has a 240 mm bore, 300 mm outer diameter and 28 mm width (9.449 × 11.811 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61848-NTN need?", "a": "The open 61848-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61848 bore code work?", "a": "The last two digits of 61848 are bore code 48, giving 48 × 5 = 240 mm bore. The 300 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61848?", "a": "NTN lists the open 61848 under the bare designation 6848; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 240 mm bore envelope." }, { "q": "Is 6848 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61848-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61848-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61848", "equiv_brand": "SKF", "level": "partial", "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6848", "61848", "61848-NTN" ], "locale_variants": {} }, { "sku": "61948-NTN", "brand": "NTN", "manufacturer_designation": "6948", "series": "61900-series", "type": "deep_groove", "d_mm": 240, "D_mm": 320, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 188, "static_load_kN": 203, "fatigue_load_limit_kN": 8.05, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 8280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61948 carries bore code 48 = 240 mm. Outside diameter 320 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 240 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61948-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 240×320×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61948-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 320 mm OD should be round within IT7; an oval bore pinches the outer ring of 61948-NTN and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61948-NTN-C3. No clearance suffix means normal CN clearance.", "The open 61948 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 240 mm bore places 61948 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1800 r/min for 61948; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 188 kN dynamic load rating (C) and 203 kN static (C0), 8.05 kN fatigue load limit Cu, 61948 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8280 g (8.3 kg), 61948 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 240×320×38 mm envelope of 61948 gives a D/d ratio of 1.33 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 188/203 kN load ratings, 8.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8280 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6948 on the 240×320×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61948 in a rated drive.", "Order the C3 internal-clearance version (61948 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61948 is listed." ], "faq": [ { "q": "What are the dimensions of a 61948-NTN bearing?", "a": "A 61948-NTN deep-groove ball bearing has a 240 mm bore, 320 mm outer diameter and 38 mm width (9.449 × 12.598 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61948-NTN need?", "a": "The open 61948-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61948 bore code work?", "a": "The last two digits of 61948 are bore code 48, giving 48 × 5 = 240 mm bore. The 320 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61948?", "a": "NTN lists the open 61948 under the bare designation 6948; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 240 mm bore envelope." }, { "q": "Is 6948 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61948-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61948-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61948-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61948", "equiv_brand": "SKF", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61948-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6948", "61948", "61948-NTN" ], "locale_variants": {} }, { "sku": "16048", "brand": "NTN", "manufacturer_designation": "16048", "series": "16000-series", "type": "deep_groove", "d_mm": 240, "D_mm": 360, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 197, "static_load_kN": 217, "fatigue_load_limit_kN": 8.3, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 12100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16048 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 48 by five gives the 240 mm bore; the 360 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 240 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 240 mm of 16048 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Because the 160xx narrow section shares the 360 mm OD of the 6048 at 240 mm bore but is only 37 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "Storage matters for open bearings: 16048 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16048 units.", "A 240 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 360 mm OD should be round within IT7; an oval bore pinches the outer ring of 16048 and shows up later as two-point loaded raceway wear.", "The open 16048 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 240 mm bore places 16048 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1700 r/min for 16048; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 197 kN dynamic load rating (C) and 217 kN static (C0), 8.3 kN fatigue load limit Cu, 16048 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 12100 g (12.1 kg), 16048 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 240×360×37 mm envelope of 16048 gives a D/d ratio of 1.50 and 60.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 197/217 kN load ratings, 8.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 12100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16048 on the 240×360×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16048 in a rated drive.", "Standard catalogue stock of 16048 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 16048 bearing?", "a": "A 16048 deep-groove ball bearing has a 240 mm bore, 360 mm outer diameter and 37 mm width (9.449 × 14.173 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 16048 have?", "a": "Unless a clearance suffix says otherwise, 16048 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16048 and verify the residual clearance after mounting." }, { "q": "How should 16048 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 240 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 16048?", "a": "NTN lists the open 16048 under the bare designation 16048; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 240 mm bore envelope." }, { "q": "What cage does NTN fit in 16048?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16048-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 240×360×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16048" ], "locale_variants": {} }, { "sku": "6048-NTN", "brand": "NTN", "manufacturer_designation": "6048", "series": "6000-series", "type": "deep_groove", "d_mm": 240, "D_mm": 360, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 276, "static_load_kN": 310, "fatigue_load_limit_kN": 12.8, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 16800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6048 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 48 by five gives the 240 mm bore; the 360 mm outside diameter and 56 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 240 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 240 mm bore uses a smaller 360 mm OD than a 6248; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6048-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 240×360×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6048-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 240 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6048-NTN.", "Never mix components between two 6048-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6048 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 240 mm bore places 6048 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1700 r/min for 6048; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6048 at 276 kN dynamic (C) and 310 kN static (C0), 12.8 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 16800 g (16.8 kg), 6048 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 240×360×56 mm envelope of 6048 gives a D/d ratio of 1.50 and 60.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 276/310 kN load ratings, 12.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 16800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6048 on the 240×360×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6048 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6048 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6048-NTN bearing?", "a": "A 6048-NTN deep-groove ball bearing has a 240 mm bore, 360 mm outer diameter and 56 mm width (9.449 × 14.173 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6048 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6048 uses the same ISO 15 envelope (240×360×56 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6048-NTN have?", "a": "Unless a clearance suffix says otherwise, 6048-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6048 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6048?", "a": "NTN lists the open 6048 under the bare designation 6048; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 240 mm bore envelope." }, { "q": "Is 6048 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6048-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 240×360×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6048", "equiv_brand": "SKF", "level": "full", "note": "Same 240×360×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6048-M", "equiv_brand": "SKF", "level": "full", "note": "Same 240×360×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6048", "6048-NTN" ], "locale_variants": {} }, { "sku": "61852-NTN", "brand": "NTN", "manufacturer_designation": "6852", "series": "61800-series", "type": "deep_groove", "d_mm": 260, "D_mm": 320, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 96.5, "static_load_kN": 120, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 5000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61852 carries bore code 52 = 260 mm. Outside diameter 320 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 260 mm bore the ring mass is significant: heat 61852 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 260 mm bore has only a 30.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6252.", "Storage matters for open bearings: 61852-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61852 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61852 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 260 mm bore places 61852 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1700 r/min for 61852; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 96.5 kN dynamic load rating (C) and 120 kN static (C0), 4.65 kN fatigue load limit Cu, 61852 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5000 g (5.0 kg), 61852 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 260×320×28 mm envelope of 61852 gives a D/d ratio of 1.23 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 96.5/120 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6852 on the 260×320×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61852 in a rated drive.", "Order the C3 internal-clearance version (61852 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61852 is listed." ], "faq": [ { "q": "What are the dimensions of a 61852-NTN bearing?", "a": "A 61852-NTN deep-groove ball bearing has a 260 mm bore, 320 mm outer diameter and 28 mm width (10.236 × 12.598 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61852-NTN have?", "a": "Unless a clearance suffix says otherwise, 61852-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61852 and verify the residual clearance after mounting." }, { "q": "How should 61852-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 260 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61852?", "a": "NTN lists the open 61852 under the bare designation 6852; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 260 mm bore envelope." }, { "q": "Is 6852 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61852-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 260×320×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61852", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×320×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6852", "61852", "61852-NTN" ], "locale_variants": {} }, { "sku": "61952-NTN", "brand": "NTN", "manufacturer_designation": "6952", "series": "61900-series", "type": "deep_groove", "d_mm": 260, "D_mm": 360, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 245, "static_load_kN": 280, "fatigue_load_limit_kN": 10.9, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 13900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61952 carries bore code 52 = 260 mm. Outside diameter 360 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 260 mm bore the ring mass is significant: heat 61952 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (50.0 mm section height at 260 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61952-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61952 units.", "A 260 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Never mix components between two 61952-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61952 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 260 mm bore places 61952 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1600 r/min for 61952; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 245 kN dynamic load rating (C) and 280 kN static (C0), 10.9 kN fatigue load limit Cu, 61952 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 13900 g (13.9 kg), 61952 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 260×360×46 mm envelope of 61952 gives a D/d ratio of 1.38 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 245/280 kN load ratings, 10.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 13900 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6952 on the 260×360×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61952 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61952-NTN bearing?", "a": "A 61952-NTN deep-groove ball bearing has a 260 mm bore, 360 mm outer diameter and 46 mm width (10.236 × 14.173 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61952-NTN need?", "a": "The open 61952-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61952 bore code work?", "a": "The last two digits of 61952 are bore code 52, giving 52 × 5 = 260 mm bore. The 360 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61952?", "a": "NTN lists the open 61952 under the bare designation 6952; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 260 mm bore envelope." }, { "q": "What cage does NTN fit in 6952?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61952", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×360×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61952-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×360×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6952", "61952", "61952-NTN" ], "locale_variants": {} }, { "sku": "16052", "brand": "NTN", "manufacturer_designation": "16052", "series": "16000-series", "type": "deep_groove", "d_mm": 260, "D_mm": 400, "B_mm": 44, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 252, "static_load_kN": 299, "fatigue_load_limit_kN": 11.1, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16052 carries bore code 52 = 260 mm. Outside diameter 400 mm and width 44 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 260 mm bore the ring mass is significant: heat 16052 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 160xx narrow section at 260 mm bore shares the 400 mm outside diameter of the 6052 but is only 44 mm wide; a 6052 in a 44 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16052 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×400×44 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16052 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 260 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16052 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 260 mm bore places 16052 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1500 r/min for 16052; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16052 at 252 kN dynamic (C) and 299 kN static (C0), 11.1 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 18500 g (18.5 kg), 16052 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 260×400×44 mm envelope of 16052 gives a D/d ratio of 1.54 and 70.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 252/299 kN load ratings, 11.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 18500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16052 on the 260×400×44 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16052 in a rated drive.", "Standard catalogue stock of 16052 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16052 bearing?", "a": "A 16052 deep-groove ball bearing has a 260 mm bore, 400 mm outer diameter and 44 mm width (10.236 × 15.748 × 1.732 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 16052 mean?", "a": "A bare 16052 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 260 mm bore?", "a": "160 is the narrow extra-light section: 400×44 mm with a 70.0 mm radial section at 260 mm bore. It has the same bore and outside diameter as the 6052 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN order number for an open 16052?", "a": "NTN lists the open 16052 under the bare designation 16052; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 260 mm bore envelope." }, { "q": "What cage does NTN fit in 16052?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16052-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 260×400×44 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16052" ], "locale_variants": {} }, { "sku": "6052-NTN", "brand": "NTN", "manufacturer_designation": "6052", "series": "6000-series", "type": "deep_groove", "d_mm": 260, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 325, "static_load_kN": 375, "fatigue_load_limit_kN": 15.1, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 25000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6052 carries bore code 52 = 260 mm. Outside diameter 400 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 260 mm of 6052-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 260 mm bore uses a smaller 400 mm OD than a 6252; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6052-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6052 units.", "Measure the shaft, do not trust the drawing: a 260 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6052-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6052 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 260 mm bore places 6052 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1500 r/min for 6052; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6052 at 325 kN dynamic (C) and 375 kN static (C0), 15.1 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 25000 g (25.0 kg), 6052 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 260×400×65 mm envelope of 6052 gives a D/d ratio of 1.54 and 70.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 325/375 kN load ratings, 15.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 25000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6052 on the 260×400×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6052 in a rated drive.", "Order the C3 internal-clearance version (6052 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6052 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6052-NTN bearing?", "a": "A 6052-NTN deep-groove ball bearing has a 260 mm bore, 400 mm outer diameter and 65 mm width (10.236 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6052 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6052 uses the same ISO 15 envelope (260×400×65 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6052-NTN have?", "a": "Unless a clearance suffix says otherwise, 6052-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6052 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6052?", "a": "NTN lists the open 6052 under the bare designation 6052; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 260 mm bore envelope." }, { "q": "Is 6052 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6052", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6052-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6052", "6052-NTN" ], "locale_variants": {} }, { "sku": "61856-NTN", "brand": "NTN", "manufacturer_designation": "6856", "series": "61800-series", "type": "deep_groove", "d_mm": 280, "D_mm": 350, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 151, "static_load_kN": 177, "fatigue_load_limit_kN": 6.65, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 7400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61856 carries bore code 56 = 280 mm. Outside diameter 350 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 280 mm bore has only a 35.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6256.", "The open 61856-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 280×350×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61856-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 280 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61856-NTN.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 350 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61856-NTN.", "The open 61856 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 280 mm bore places 61856 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1600 r/min for 61856; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 151 kN dynamic load rating (C) and 177 kN static (C0), 6.65 kN fatigue load limit Cu, 61856 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7400 g (7.4 kg), 61856 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 280×350×33 mm envelope of 61856 gives a D/d ratio of 1.25 and only 35.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 151/177 kN load ratings, 6.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6856 on the 280×350×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61856 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61856 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61856-NTN bearing?", "a": "A 61856-NTN deep-groove ball bearing has a 280 mm bore, 350 mm outer diameter and 33 mm width (11.024 × 13.78 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61856 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61856 uses the same ISO 15 envelope (280×350×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61856-NTN have?", "a": "Unless a clearance suffix says otherwise, 61856-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61856 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61856?", "a": "NTN lists the open 61856 under the bare designation 6856; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 280 mm bore envelope." }, { "q": "Does NTN offer 61856 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6856 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61856", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×350×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61856-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×350×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6856", "61856", "61856-NTN" ], "locale_variants": {} }, { "sku": "61956-NTN", "brand": "NTN", "manufacturer_designation": "6956", "series": "61900-series", "type": "deep_groove", "d_mm": 280, "D_mm": 380, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 252, "static_load_kN": 299, "fatigue_load_limit_kN": 11.1, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 14800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61956 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 56 by five gives the 280 mm bore; the 380 mm outside diameter and 46 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 280 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 280 mm bore the ring mass is significant: heat 61956 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 280 mm bore (50.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61956-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61956 units.", "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 280 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61956 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 280 mm bore places 61956 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1500 r/min for 61956; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61956 at 252 kN dynamic (C) and 299 kN static (C0), 11.1 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 14800 g (14.8 kg), 61956 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 280×380×46 mm envelope of 61956 gives a D/d ratio of 1.36 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 252/299 kN load ratings, 11.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 14800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6956 on the 280×380×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61956 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61956 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61956-NTN bearing?", "a": "A 61956-NTN deep-groove ball bearing has a 280 mm bore, 380 mm outer diameter and 46 mm width (11.024 × 14.961 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61956-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 280 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61956-NTN need?", "a": "The open 61956-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61956?", "a": "NTN lists the open 61956 under the bare designation 6956; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 280 mm bore envelope." }, { "q": "Is 6956 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61956", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×380×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61956-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×380×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6956", "61956", "61956-NTN" ], "locale_variants": {} }, { "sku": "16056", "brand": "NTN", "manufacturer_designation": "16056", "series": "16000-series", "type": "deep_groove", "d_mm": 280, "D_mm": 420, "B_mm": 44, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 257, "static_load_kN": 315, "fatigue_load_limit_kN": 11.3, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16056 carries bore code 56 = 280 mm. Outside diameter 420 mm and width 44 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 280 mm bore the ring mass is significant: heat 16056 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 160xx narrow section at 280 mm bore shares the 420 mm outside diameter of the 6056 but is only 44 mm wide; a 6056 in a 44 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16056 has no lubricant retention: grease escapes and contaminants migrate straight into the 280×420×44 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16056 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 44 mm-wide ring of 16056 drags the lip and overheats it.", "The housing bore for the 420 mm OD should be round within IT7; an oval bore pinches the outer ring of 16056 and shows up later as two-point loaded raceway wear.", "The open 16056 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 280 mm bore places 16056 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1400 r/min for 16056; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 16056 at 257 kN dynamic (C) and 315 kN static (C0), 11.3 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 23000 g (23.0 kg), 16056 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 280×420×44 mm envelope of 16056 gives a D/d ratio of 1.50 and 70.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 257/315 kN load ratings, 11.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 1400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 23000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16056 on the 280×420×44 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16056 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 16056 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16056 bearing?", "a": "A 16056 deep-groove ball bearing has a 280 mm bore, 420 mm outer diameter and 44 mm width (11.024 × 16.535 × 1.732 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16056 bore code work?", "a": "The last two digits of 16056 are bore code 56, giving 56 × 5 = 280 mm bore. The 420 mm outside diameter and 44 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16056 mean?", "a": "A bare 16056 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 16056?", "a": "NTN lists the open 16056 under the bare designation 16056; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 280 mm bore envelope." }, { "q": "Is 16056 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "16056-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 280×420×44 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16056" ], "locale_variants": {} }, { "sku": "6056-NTN", "brand": "NTN", "manufacturer_designation": "6056", "series": "6000-series", "type": "deep_groove", "d_mm": 280, "D_mm": 420, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 360, "static_load_kN": 420, "fatigue_load_limit_kN": 16.9, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 31000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6056 carries bore code 56 = 280 mm. Outside diameter 420 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 280 mm bore uses a smaller 420 mm OD than a 6256; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6056-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 280×420×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6056-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 65 mm-wide ring of 6056-NTN drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6056 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 280 mm bore places 6056 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1400 r/min for 6056; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 6056 at 360 kN dynamic (C) and 420 kN static (C0), 16.9 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 31000 g (31.0 kg), 6056 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 280×420×65 mm envelope of 6056 gives a D/d ratio of 1.50 and 70.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 360/420 kN load ratings, 16.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 31000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6056 on the 280×420×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6056 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6056 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6056-NTN bearing?", "a": "A 6056-NTN deep-groove ball bearing has a 280 mm bore, 420 mm outer diameter and 65 mm width (11.024 × 16.535 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6056-NTN need?", "a": "The open 6056-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6056 bore code work?", "a": "The last two digits of 6056 are bore code 56, giving 56 × 5 = 280 mm bore. The 420 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6056?", "a": "NTN lists the open 6056 under the bare designation 6056; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 280 mm bore envelope." }, { "q": "Is 6056 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6056", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×420×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6056-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×420×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6056", "6056-NTN" ], "locale_variants": {} }, { "sku": "61860-NTN", "brand": "NTN", "manufacturer_designation": "6860", "series": "61800-series", "type": "deep_groove", "d_mm": 300, "D_mm": 380, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 179, "static_load_kN": 210, "fatigue_load_limit_kN": 7.6, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61860 carries bore code 60 = 300 mm. Outside diameter 380 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 300 mm of 61860-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 40.0 mm of radial section separates bore and OD on the 618xx series at 300 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6260.", "Storage matters for open bearings: 61860-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61860 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 380 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61860-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61860-NTN-C3. No clearance suffix means normal CN clearance.", "The open 61860 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 300 mm bore places 61860 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1500 r/min for 61860; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 179 kN dynamic load rating (C) and 210 kN static (C0), 7.6 kN fatigue load limit Cu, 61860 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 10500 g (10.5 kg), 61860 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 300×380×38 mm envelope of 61860 gives a D/d ratio of 1.27 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 179/210 kN load ratings, 7.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 10500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6860 on the 300×380×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61860 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 61860 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61860-NTN bearing?", "a": "A 61860-NTN deep-groove ball bearing has a 300 mm bore, 380 mm outer diameter and 38 mm width (11.811 × 14.961 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61860-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 300 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61860-NTN need?", "a": "The open 61860-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61860?", "a": "NTN lists the open 61860 under the bare designation 6860; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 300 mm bore envelope." }, { "q": "Does NTN offer 61860 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6860 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61860", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×380×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61860-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×380×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6860", "61860", "61860-NTN" ], "locale_variants": {} }, { "sku": "61960-NTN", "brand": "NTN", "manufacturer_designation": "6960", "series": "61900-series", "type": "deep_groove", "d_mm": 300, "D_mm": 420, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 305, "static_load_kN": 375, "fatigue_load_limit_kN": 13.7, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 23500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61960 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 60 by five gives the 300 mm bore; the 420 mm outside diameter and 56 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 300 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 300 mm of 61960-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 300 mm bore (60.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61960-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61960 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 56 mm-wide ring of 61960-NTN drags the lip and overheats it.", "Never mix components between two 61960-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61960 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 300 mm bore places 61960 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1400 r/min for 61960; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61960 at 305 kN dynamic (C) and 375 kN static (C0), 13.7 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 23500 g (23.5 kg), 61960 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 300×420×56 mm envelope of 61960 gives a D/d ratio of 1.40 and 60.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 305/375 kN load ratings, 13.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 1400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 23500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6960 on the 300×420×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61960 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61960-NTN bearing?", "a": "A 61960-NTN deep-groove ball bearing has a 300 mm bore, 420 mm outer diameter and 56 mm width (11.811 × 16.535 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61960-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 300 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61960-NTN need?", "a": "The open 61960-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61960?", "a": "NTN lists the open 61960 under the bare designation 6960; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 300 mm bore envelope." }, { "q": "Is 6960 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61960", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×420×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61960-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×420×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6960", "61960", "61960-NTN" ], "locale_variants": {} }, { "sku": "16060", "brand": "NTN", "manufacturer_designation": "16060", "series": "16000-series", "type": "deep_groove", "d_mm": 300, "D_mm": 460, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 325, "static_load_kN": 410, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 32500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16060 carries bore code 60 = 300 mm. Outside diameter 460 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Because the 160xx narrow section shares the 460 mm OD of the 6060 at 300 mm bore but is only 50 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16060 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×460×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16060 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 300 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 16060.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16060-C3. No clearance suffix means normal CN clearance.", "The open 16060 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 300 mm bore places 16060 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1300 r/min for 16060; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 16060 at 325 kN dynamic (C) and 410 kN static (C0), 14.5 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 32500 g (32.5 kg), 16060 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 300×460×50 mm envelope of 16060 gives a D/d ratio of 1.53 and 80.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 325/410 kN load ratings, 14.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 1300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 32500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16060 on the 300×460×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16060 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 16060 bearing?", "a": "A 16060 deep-groove ball bearing has a 300 mm bore, 460 mm outer diameter and 50 mm width (11.811 × 18.11 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 16060 need?", "a": "The open 16060 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 16060 bore code work?", "a": "The last two digits of 16060 are bore code 60, giving 60 × 5 = 300 mm bore. The 460 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 16060?", "a": "NTN lists the open 16060 under the bare designation 16060; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 300 mm bore envelope." }, { "q": "What cage does NTN fit in 16060?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16060-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×460×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16060" ], "locale_variants": {} }, { "sku": "6060", "brand": "NTN", "manufacturer_designation": "6060", "series": "6000-series", "type": "deep_groove", "d_mm": 300, "D_mm": 460, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 395, "static_load_kN": 480, "fatigue_load_limit_kN": 18.4, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 43800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6060 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 60 by five gives the 300 mm bore; the 460 mm outside diameter and 74 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 300 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 300 mm bore uses a smaller 460 mm OD than a 6260; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6060 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×460×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6060 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 6060 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 74 mm-wide ring of 6060 drags the lip and overheats it.", "The open 6060 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 300 mm bore places 6060 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1300 r/min for 6060; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 6060 at 395 kN dynamic (C) and 480 kN static (C0), 18.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 43800 g (43.8 kg), 6060 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 300×460×74 mm envelope of 6060 gives a D/d ratio of 1.53 and 80.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 395/480 kN load ratings, 18.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 1300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 43800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6060 on the 300×460×74 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6060 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6060 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6060 bearing?", "a": "A 6060 deep-groove ball bearing has a 300 mm bore, 460 mm outer diameter and 74 mm width (11.811 × 18.11 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6060 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 300 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6060 need?", "a": "The open 6060 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6060?", "a": "NTN lists the open 6060 under the bare designation 6060; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 300 mm bore envelope." }, { "q": "Does NTN offer 6060 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6060 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6060-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×460×74 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6060" ], "locale_variants": {} }, { "sku": "61864-NTN", "brand": "NTN", "manufacturer_designation": "6864", "series": "61800-series", "type": "deep_groove", "d_mm": 320, "D_mm": 400, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 186, "static_load_kN": 228, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 10900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61864 carries bore code 64 = 320 mm. Outside diameter 400 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 320 mm of 61864-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 320 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6264.", "The open 61864-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 320×400×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61864-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 400 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61864-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61864 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 320 mm bore places 61864 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1400 r/min for 61864; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 186 kN dynamic load rating (C) and 228 kN static (C0), 7.95 kN fatigue load limit Cu, 61864 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 10900 g (10.9 kg), 61864 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 320×400×38 mm envelope of 61864 gives a D/d ratio of 1.25 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 186/228 kN load ratings, 7.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 1400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 10900 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6864 on the 320×400×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61864 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61864 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61864-NTN bearing?", "a": "A 61864-NTN deep-groove ball bearing has a 320 mm bore, 400 mm outer diameter and 38 mm width (12.598 × 15.748 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 320 mm bore?", "a": "618 is an extra-thin section: 400×38 mm, only 40.0 mm radial section at 320 mm bore, far smaller than a 6264, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61864 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61864 uses the same ISO 15 envelope (320×400×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61864?", "a": "NTN lists the open 61864 under the bare designation 6864; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 320 mm bore envelope." }, { "q": "Is 6864 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61864", "equiv_brand": "SKF", "level": "partial", "note": "Same 320×400×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61864-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 320×400×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6864", "61864", "61864-NTN" ], "locale_variants": {} }, { "sku": "61964", "brand": "NTN", "manufacturer_designation": "6964", "series": "61900-series", "type": "deep_groove", "d_mm": 320, "D_mm": 440, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 315, "static_load_kN": 405, "fatigue_load_limit_kN": 14.1, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 24800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61964 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 64 by five gives the 320 mm bore; the 440 mm outside diameter and 56 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 320 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 320 mm bore the ring mass is significant: heat 61964 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 320 mm bore (60.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61964 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×440×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61964 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 440 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61964.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61964 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 320 mm bore places 61964 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1300 r/min for 61964; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61964 at 315 kN dynamic (C) and 405 kN static (C0), 14.1 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 24800 g (24.8 kg), 61964 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 320×440×56 mm envelope of 61964 gives a D/d ratio of 1.38 and only 60.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 315/405 kN load ratings, 14.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 1300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 24800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6964 on the 320×440×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61964 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61964 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61964 bearing?", "a": "A 61964 deep-groove ball bearing has a 320 mm bore, 440 mm outer diameter and 56 mm width (12.598 × 17.323 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61964 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 320 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61964 need?", "a": "The open 61964 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61964?", "a": "NTN lists the open 61964 under the bare designation 6964; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 320 mm bore envelope." }, { "q": "What cage does NTN fit in 6964?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61964-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 320×440×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6964", "61964" ], "locale_variants": {} }, { "sku": "16064", "brand": "NTN", "manufacturer_designation": "16064", "series": "16000-series", "type": "deep_groove", "d_mm": 320, "D_mm": 480, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 335, "static_load_kN": 440, "fatigue_load_limit_kN": 14.9, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 34200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16064 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 64 by five gives the 320 mm bore; the 480 mm outside diameter and 50 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 320 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 320 mm bore the ring mass is significant: heat 16064 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 160xx narrow section at 320 mm bore shares the 480 mm outside diameter of the 6064 but is only 50 mm wide; a 6064 in a 50 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16064 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×480×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16064 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 50 mm-wide ring of 16064 drags the lip and overheats it.", "Vibration during standstill brinells the raceways of a 320 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 16064 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 320 mm bore places 16064 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1200 r/min for 16064; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 16064 at 335 kN dynamic (C) and 440 kN static (C0), 14.9 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 34200 g (34.2 kg), 16064 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 320×480×50 mm envelope of 16064 gives a D/d ratio of 1.50 and 80.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 335/440 kN load ratings, 14.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 34200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16064 on the 320×480×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16064 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16064 bearing?", "a": "A 16064 deep-groove ball bearing has a 320 mm bore, 480 mm outer diameter and 50 mm width (12.598 × 18.898 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16064 bore code work?", "a": "The last two digits of 16064 are bore code 64, giving 64 × 5 = 320 mm bore. The 480 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16064 mean?", "a": "A bare 16064 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 16064?", "a": "NTN lists the open 16064 under the bare designation 16064; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 320 mm bore envelope." }, { "q": "Is 16064 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "16064-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 320×480×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16064" ], "locale_variants": {} }, { "sku": "6064", "brand": "NTN", "manufacturer_designation": "6064", "series": "6000-series", "type": "deep_groove", "d_mm": 320, "D_mm": 480, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 410, "static_load_kN": 530, "fatigue_load_limit_kN": 19.3, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 46100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6064 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 64 by five gives the 320 mm bore; the 480 mm outside diameter and 74 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 320 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 320 mm bore uses a smaller 480 mm OD than a 6264; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6064 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6064 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 74 mm-wide ring of 6064 drags the lip and overheats it.", "The housing bore for the 480 mm OD should be round within IT7; an oval bore pinches the outer ring of 6064 and shows up later as two-point loaded raceway wear.", "The open 6064 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 320 mm bore places 6064 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1200 r/min for 6064; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 410 kN dynamic load rating (C) and 530 kN static (C0), 19.3 kN fatigue load limit Cu, 6064 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 46100 g (46.1 kg), 6064 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 320×480×74 mm envelope of 6064 gives a D/d ratio of 1.50 and 80.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 410/530 kN load ratings, 19.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 1200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 46100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6064 on the 320×480×74 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6064 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6064 bearing?", "a": "A 6064 deep-groove ball bearing has a 320 mm bore, 480 mm outer diameter and 74 mm width (12.598 × 18.898 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6064 mean?", "a": "A bare 6064 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 320 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (480×74 mm, 80.0 mm radial section) at 320 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN order number for an open 6064?", "a": "NTN lists the open 6064 under the bare designation 6064; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 320 mm bore envelope." }, { "q": "Does NTN offer 6064 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6064 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6064-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 320×480×74 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6064" ], "locale_variants": {} }, { "sku": "61868-NTN", "brand": "NTN", "manufacturer_designation": "6868", "series": "61800-series", "type": "deep_groove", "d_mm": 340, "D_mm": 420, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 189, "static_load_kN": 236, "fatigue_load_limit_kN": 8.05, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61868 carries bore code 68 = 340 mm. Outside diameter 420 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 340 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 340 mm of 61868-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 340 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6268.", "The open 61868-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 340×420×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61868 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 340 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61868-NTN.", "The open 61868 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 340 mm bore places 61868 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1300 r/min for 61868; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 189 kN dynamic load rating (C) and 236 kN static (C0), 8.05 kN fatigue load limit Cu, 61868 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 11500 g (11.5 kg), 61868 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 340×420×38 mm envelope of 61868 gives a D/d ratio of 1.24 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 189/236 kN load ratings, 8.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 1300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 11500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6868 on the 340×420×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61868 in a rated drive.", "Standard catalogue stock of 61868 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61868 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61868-NTN bearing?", "a": "A 61868-NTN deep-groove ball bearing has a 340 mm bore, 420 mm outer diameter and 38 mm width (13.386 × 16.535 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61868-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 340 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61868-NTN need?", "a": "The open 61868-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61868?", "a": "NTN lists the open 61868 under the bare designation 6868; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 340 mm bore envelope." }, { "q": "Does NTN offer 61868 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6868 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61868", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×420×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61868-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×420×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6868", "61868", "61868-NTN" ], "locale_variants": {} }, { "sku": "61968", "brand": "NTN", "manufacturer_designation": "6968", "series": "61900-series", "type": "deep_groove", "d_mm": 340, "D_mm": 460, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 325, "static_load_kN": 430, "fatigue_load_limit_kN": 14.4, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 26200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61968 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 68 by five gives the 340 mm bore; the 460 mm outside diameter and 56 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 340 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 340 mm of 61968 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 340 mm bore (60.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61968 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×460×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61968 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 460 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61968.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61968 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 340 mm bore places 61968 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1200 r/min for 61968; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61968 at 325 kN dynamic (C) and 430 kN static (C0), 14.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 26200 g (26.2 kg), 61968 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 340×460×56 mm envelope of 61968 gives a D/d ratio of 1.35 and only 60.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 325/430 kN load ratings, 14.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 1200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 26200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6968 on the 340×460×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61968 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61968 is listed.", "Order the C3 internal-clearance version (61968 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61968 bearing?", "a": "A 61968 deep-groove ball bearing has a 340 mm bore, 460 mm outer diameter and 56 mm width (13.386 × 18.11 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61968 mean?", "a": "A bare 61968 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 340 mm bore?", "a": "619 is a thin section one step above 618: 460×56 mm with a 60.0 mm radial section at 340 mm bore; a 6268 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN order number for an open 61968?", "a": "NTN lists the open 61968 under the bare designation 6968; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 340 mm bore envelope." }, { "q": "Is 6968 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61968-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×460×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6968", "61968" ], "locale_variants": {} }, { "sku": "16068", "brand": "NTN", "manufacturer_designation": "16068", "series": "16000-series", "type": "deep_groove", "d_mm": 340, "D_mm": 520, "B_mm": 57, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 380, "static_load_kN": 515, "fatigue_load_limit_kN": 17, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 47100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16068 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 68 by five gives the 340 mm bore; the 520 mm outside diameter and 57 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 340 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 340 mm bore the ring mass is significant: heat 16068 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 160xx narrow section at 340 mm bore shares the 520 mm outside diameter of the 6068 but is only 57 mm wide; a 6068 in a 57 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16068 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×520×57 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16068 units.", "Shaft and housing fillets must clear the bearing chamfer so the 57 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 520 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16068.", "The open 16068 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 340 mm bore places 16068 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 16068; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 16068 at 380 kN dynamic (C) and 515 kN static (C0), 17 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 47100 g (47.1 kg), 16068 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 340×520×57 mm envelope of 16068 gives a D/d ratio of 1.53 and 90.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 380/515 kN load ratings, 17 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 47100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16068 on the 340×520×57 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16068 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16068 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 16068 bearing?", "a": "A 16068 deep-groove ball bearing has a 340 mm bore, 520 mm outer diameter and 57 mm width (13.386 × 20.472 × 2.244 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 16068 have?", "a": "Unless a clearance suffix says otherwise, 16068 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16068 and verify the residual clearance after mounting." }, { "q": "How should 16068 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 340 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 16068?", "a": "NTN lists the open 16068 under the bare designation 16068; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 340 mm bore envelope." }, { "q": "What cage does NTN fit in 16068?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16068-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×520×57 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16068" ], "locale_variants": {} }, { "sku": "6068", "brand": "NTN", "manufacturer_designation": "6068", "series": "6000-series", "type": "deep_groove", "d_mm": 340, "D_mm": 520, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 465, "static_load_kN": 610, "fatigue_load_limit_kN": 21.9, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 61800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6068 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 68 by five gives the 340 mm bore; the 520 mm outside diameter and 82 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 340 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 340 mm of 6068 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 340 mm bore uses a smaller 520 mm OD than a 6268; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6068 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6068 units.", "The housing bore for the 520 mm OD should be round within IT7; an oval bore pinches the outer ring of 6068 and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 520 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6068.", "The open 6068 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 340 mm bore places 6068 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 6068; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 465 kN dynamic load rating (C) and 610 kN static (C0), 21.9 kN fatigue load limit Cu, 6068 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 61800 g (61.8 kg), 6068 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 340×520×82 mm envelope of 6068 gives a D/d ratio of 1.53 and 90.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 465/610 kN load ratings, 21.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 61800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6068 on the 340×520×82 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6068 in a rated drive.", "Standard catalogue stock of 6068 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6068 bearing?", "a": "A 6068 deep-groove ball bearing has a 340 mm bore, 520 mm outer diameter and 82 mm width (13.386 × 20.472 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6068 need?", "a": "The open 6068 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6068 bore code work?", "a": "The last two digits of 6068 are bore code 68, giving 68 × 5 = 340 mm bore. The 520 mm outside diameter and 82 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6068?", "a": "NTN lists the open 6068 under the bare designation 6068; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 340 mm bore envelope." }, { "q": "What cage does NTN fit in 6068?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6068-M", "equiv_brand": "SKF", "level": "full", "note": "Same 340×520×82 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6068" ], "locale_variants": {} }, { "sku": "61872", "brand": "NTN", "manufacturer_designation": "6872", "series": "61800-series", "type": "deep_groove", "d_mm": 360, "D_mm": 440, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 207, "static_load_kN": 258, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 12300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61872 carries bore code 72 = 360 mm. Outside diameter 440 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 360 mm of 61872 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 40.0 mm of radial section separates bore and OD on the 618xx series at 360 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6272.", "The open 61872 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×440×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61872 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61872-C3. No clearance suffix means normal CN clearance.", "A 360 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61872 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 360 mm bore places 61872 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1200 r/min for 61872; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 207 kN dynamic load rating (C) and 258 kN static (C0), 8.55 kN fatigue load limit Cu, 61872 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 12300 g (12.3 kg), 61872 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 360×440×38 mm envelope of 61872 gives a D/d ratio of 1.22 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 207/258 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 1200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 12300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6872 on the 360×440×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61872 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61872 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61872 bearing?", "a": "A 61872 deep-groove ball bearing has a 360 mm bore, 440 mm outer diameter and 38 mm width (14.173 × 17.323 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61872 mean?", "a": "A bare 61872 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 360 mm bore?", "a": "618 is an extra-thin section: 440×38 mm, only 40.0 mm radial section at 360 mm bore, far smaller than a 6272, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN order number for an open 61872?", "a": "NTN lists the open 61872 under the bare designation 6872; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 360 mm bore envelope." }, { "q": "What cage does NTN fit in 6872?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61872-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×440×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6872", "61872" ], "locale_variants": {} }, { "sku": "61972", "brand": "NTN", "manufacturer_designation": "6972", "series": "61900-series", "type": "deep_groove", "d_mm": 360, "D_mm": 480, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 330, "static_load_kN": 455, "fatigue_load_limit_kN": 14.8, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 27500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61972 carries bore code 72 = 360 mm. Outside diameter 480 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 360 mm of 61972 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 360 mm bore (60.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61972 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61972 units.", "Never mix components between two 61972 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 480 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61972.", "The open 61972 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 360 mm bore places 61972 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 61972; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61972 at 330 kN dynamic (C) and 455 kN static (C0), 14.8 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 27500 g (27.5 kg), 61972 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 360×480×56 mm envelope of 61972 gives a D/d ratio of 1.33 and only 60.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 330/455 kN load ratings, 14.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 27500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6972 on the 360×480×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61972 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61972 bearing?", "a": "A 61972 deep-groove ball bearing has a 360 mm bore, 480 mm outer diameter and 56 mm width (14.173 × 18.898 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61972 have?", "a": "Unless a clearance suffix says otherwise, 61972 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61972 and verify the residual clearance after mounting." }, { "q": "How should 61972 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 360 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61972?", "a": "NTN lists the open 61972 under the bare designation 6972; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 360 mm bore envelope." }, { "q": "What cage does NTN fit in 6972?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61972-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×480×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6972", "61972" ], "locale_variants": {} }, { "sku": "16072", "brand": "NTN", "manufacturer_designation": "16072", "series": "16000-series", "type": "deep_groove", "d_mm": 360, "D_mm": 540, "B_mm": 57, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 390, "static_load_kN": 550, "fatigue_load_limit_kN": 17.6, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 49300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16072 carries bore code 72 = 360 mm. Outside diameter 540 mm and width 57 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 360 mm bore the ring mass is significant: heat 16072 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 160xx narrow section at 360 mm bore shares the 540 mm outside diameter of the 6072 but is only 57 mm wide; a 6072 in a 57 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "Storage matters for open bearings: 16072 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16072 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16072-C3. No clearance suffix means normal CN clearance.", "A 360 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16072 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 360 mm bore places 16072 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 16072; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 16072 at 390 kN dynamic (C) and 550 kN static (C0), 17.6 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 49300 g (49.3 kg), 16072 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 360×540×57 mm envelope of 16072 gives a D/d ratio of 1.50 and 90.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 390/550 kN load ratings, 17.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 49300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16072 on the 360×540×57 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16072 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (16072 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16072 bearing?", "a": "A 16072 deep-groove ball bearing has a 360 mm bore, 540 mm outer diameter and 57 mm width (14.173 × 21.26 × 2.244 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 16072 have?", "a": "Unless a clearance suffix says otherwise, 16072 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16072 and verify the residual clearance after mounting." }, { "q": "How should 16072 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 360 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 16072?", "a": "NTN lists the open 16072 under the bare designation 16072; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 360 mm bore envelope." }, { "q": "Is 16072 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "16072-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×540×57 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16072" ], "locale_variants": {} }, { "sku": "6072", "brand": "NTN", "manufacturer_designation": "6072", "series": "6000-series", "type": "deep_groove", "d_mm": 360, "D_mm": 540, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 485, "static_load_kN": 670, "fatigue_load_limit_kN": 23, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 64700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6072 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 72 by five gives the 360 mm bore; the 540 mm outside diameter and 82 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 360 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 360 mm of 6072 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 360 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6272 before committing to the smaller envelope.", "The open 6072 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×540×82 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6072 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 6072 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 360 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6072 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 360 mm bore places 6072 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 6072; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 485 kN dynamic load rating (C) and 670 kN static (C0), 23 kN fatigue load limit Cu, 6072 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 64700 g (64.7 kg), 6072 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 360×540×82 mm envelope of 6072 gives a D/d ratio of 1.50 and 90.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 485/670 kN load ratings, 23 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 64700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6072 on the 360×540×82 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6072 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (6072 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6072 bearing?", "a": "A 6072 deep-groove ball bearing has a 360 mm bore, 540 mm outer diameter and 82 mm width (14.173 × 21.26 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6072 have?", "a": "Unless a clearance suffix says otherwise, 6072 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6072 and verify the residual clearance after mounting." }, { "q": "How should 6072 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 360 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6072?", "a": "NTN lists the open 6072 under the bare designation 6072; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 360 mm bore envelope." }, { "q": "Is 6072 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6072-M", "equiv_brand": "SKF", "level": "full", "note": "Same 360×540×82 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6072" ], "locale_variants": {} }, { "sku": "61876", "brand": "NTN", "manufacturer_designation": "6876", "series": "61800-series", "type": "deep_groove", "d_mm": 380, "D_mm": 480, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 256, "static_load_kN": 340, "fatigue_load_limit_kN": 10.8, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 19700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61876 carries bore code 76 = 380 mm. Outside diameter 480 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 380 mm of 61876 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 50.0 mm of radial section separates bore and OD on the 618xx series at 380 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6276.", "The open 61876 has no lubricant retention: grease escapes and contaminants migrate straight into the 380×480×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61876 units.", "A 380 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61876-C3. No clearance suffix means normal CN clearance.", "The open 61876 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 380 mm bore places 61876 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 61876; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61876 at 256 kN dynamic (C) and 340 kN static (C0), 10.8 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 19700 g (19.7 kg), 61876 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 380×480×46 mm envelope of 61876 gives a D/d ratio of 1.26 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 256/340 kN load ratings, 10.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 19700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6876 on the 380×480×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61876 in a rated drive.", "Order the C3 internal-clearance version (61876 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61876 is listed." ], "faq": [ { "q": "What are the dimensions of a 61876 bearing?", "a": "A 61876 deep-groove ball bearing has a 380 mm bore, 480 mm outer diameter and 46 mm width (14.961 × 18.898 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61876 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61876 uses the same ISO 15 envelope (380×480×46 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61876 have?", "a": "Unless a clearance suffix says otherwise, 61876 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61876 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61876?", "a": "NTN lists the open 61876 under the bare designation 6876; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 380 mm bore envelope." }, { "q": "Is 6876 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61876-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 380×480×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6876", "61876" ], "locale_variants": {} }, { "sku": "61976", "brand": "NTN", "manufacturer_designation": "6976", "series": "61900-series", "type": "deep_groove", "d_mm": 380, "D_mm": 520, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 360, "static_load_kN": 510, "fatigue_load_limit_kN": 15.9, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 39800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61976 carries bore code 76 = 380 mm. Outside diameter 520 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 380 mm of 61976 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (70.0 mm section height at 380 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61976 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61976 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Shaft and housing fillets must clear the bearing chamfer so the 65 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61976 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 380 mm bore places 61976 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 61976; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61976 at 360 kN dynamic (C) and 510 kN static (C0), 15.9 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 39800 g (39.8 kg), 61976 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 380×520×65 mm envelope of 61976 gives a D/d ratio of 1.37 and only 70.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 360/510 kN load ratings, 15.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 39800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6976 on the 380×520×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61976 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61976 is listed." ], "faq": [ { "q": "What are the dimensions of a 61976 bearing?", "a": "A 61976 deep-groove ball bearing has a 380 mm bore, 520 mm outer diameter and 65 mm width (14.961 × 20.472 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61976 have?", "a": "Unless a clearance suffix says otherwise, 61976 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61976 and verify the residual clearance after mounting." }, { "q": "How should 61976 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 380 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61976?", "a": "NTN lists the open 61976 under the bare designation 6976; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 380 mm bore envelope." }, { "q": "Is 6976 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61976-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 380×520×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6976", "61976" ], "locale_variants": {} }, { "sku": "6076", "brand": "NTN", "manufacturer_designation": "6076", "series": "6000-series", "type": "deep_groove", "d_mm": 380, "D_mm": 560, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 505, "static_load_kN": 725, "fatigue_load_limit_kN": 24.1, "limiting_speed_rpm": 990, "max_rpm": 990, "weight_g": 67500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6076 carries bore code 76 = 380 mm. Outside diameter 560 mm and width 82 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 380 mm of 6076 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 380 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6276 before committing to the smaller envelope.", "Storage matters for open bearings: 6076 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6076 units.", "The housing bore for the 560 mm OD should be round within IT7; an oval bore pinches the outer ring of 6076 and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 560 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6076.", "The open 6076 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 380 mm bore places 6076 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at only 990 r/min for 6076; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 505 kN dynamic load rating (C) and 725 kN static (C0), 24.1 kN fatigue load limit Cu, 6076 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 67500 g (67.5 kg), 6076 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 380×560×82 mm envelope of 6076 gives a D/d ratio of 1.47 and 90.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 505/725 kN load ratings, 24.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 990 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 67500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6076 on the 380×560×82 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6076 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6076 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6076 bearing?", "a": "A 6076 deep-groove ball bearing has a 380 mm bore, 560 mm outer diameter and 82 mm width (14.961 × 22.047 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6076 need?", "a": "The open 6076 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6076 bore code work?", "a": "The last two digits of 6076 are bore code 76, giving 76 × 5 = 380 mm bore. The 560 mm outside diameter and 82 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6076?", "a": "NTN lists the open 6076 under the bare designation 6076; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 380 mm bore envelope." }, { "q": "Does NTN offer 6076 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6076 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6076-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 380×560×82 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6076" ], "locale_variants": {} }, { "sku": "61880", "brand": "NTN", "manufacturer_designation": "6880", "series": "61800-series", "type": "deep_groove", "d_mm": 400, "D_mm": 500, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 251, "static_load_kN": 340, "fatigue_load_limit_kN": 10.6, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 20600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61880 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 80 by five gives the 400 mm bore; the 500 mm outside diameter and 46 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 400 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 400 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 400 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6280.", "The open 61880 has no lubricant retention: grease escapes and contaminants migrate straight into the 400×500×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61880 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 400 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61880.", "The open 61880 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 400 mm bore places 61880 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at 1100 r/min for 61880; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61880 at 251 kN dynamic (C) and 340 kN static (C0), 10.6 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 20600 g (20.6 kg), 61880 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 400×500×46 mm envelope of 61880 gives a D/d ratio of 1.25 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 251/340 kN load ratings, 10.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 20600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6880 on the 400×500×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61880 in a rated drive.", "Standard catalogue stock of 61880 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61880 is listed." ], "faq": [ { "q": "What are the dimensions of a 61880 bearing?", "a": "A 61880 deep-groove ball bearing has a 400 mm bore, 500 mm outer diameter and 46 mm width (15.748 × 19.685 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 400 mm bore?", "a": "618 is an extra-thin section: 500×46 mm, only 50.0 mm radial section at 400 mm bore, far smaller than a 6280, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61880 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61880 uses the same ISO 15 envelope (400×500×46 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61880?", "a": "NTN lists the open 61880 under the bare designation 6880; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 400 mm bore envelope." }, { "q": "Does NTN offer 61880 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6880 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61880-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 400×500×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6880", "61880" ], "locale_variants": {} }, { "sku": "61980", "brand": "NTN", "manufacturer_designation": "6980", "series": "61900-series", "type": "deep_groove", "d_mm": 400, "D_mm": 540, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 370, "static_load_kN": 535, "fatigue_load_limit_kN": 16.4, "limiting_speed_rpm": 990, "max_rpm": 990, "weight_g": 41600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61980 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 80 by five gives the 400 mm bore; the 540 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 400 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 400 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 400 mm bore (70.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61980 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61980 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 400 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61980.", "The open 61980 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 400 mm bore places 61980 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 990 r/min for 61980; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61980 at 370 kN dynamic (C) and 535 kN static (C0), 16.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 41600 g (41.6 kg), 61980 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 400×540×65 mm envelope of 61980 gives a D/d ratio of 1.35 and only 70.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 370/535 kN load ratings, 16.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 990 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 41600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6980 on the 400×540×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61980 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61980 bearing?", "a": "A 61980 deep-groove ball bearing has a 400 mm bore, 540 mm outer diameter and 65 mm width (15.748 × 21.26 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 400 mm bore?", "a": "619 is a thin section one step above 618: 540×65 mm with a 70.0 mm radial section at 400 mm bore; a 6280 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61980 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61980 uses the same ISO 15 envelope (400×540×65 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61980?", "a": "NTN lists the open 61980 under the bare designation 6980; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 400 mm bore envelope." }, { "q": "Does NTN offer 61980 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6980 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61980-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 400×540×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6980", "61980" ], "locale_variants": {} }, { "sku": "6080", "brand": "NTN", "manufacturer_designation": "6080", "series": "6000-series", "type": "deep_groove", "d_mm": 400, "D_mm": 600, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 565, "static_load_kN": 825, "fatigue_load_limit_kN": 26.9, "limiting_speed_rpm": 930, "max_rpm": 930, "weight_g": 87600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6080 carries bore code 80 = 400 mm. Outside diameter 600 mm and width 90 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 400 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 400 mm of 6080 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 400 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6280 before committing to the smaller envelope.", "Storage matters for open bearings: 6080 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6080 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 600 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6080.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6080 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 400 mm bore places 6080 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 930 r/min for 6080; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 565 kN dynamic load rating (C) and 825 kN static (C0), 26.9 kN fatigue load limit Cu, 6080 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 87600 g (87.6 kg), 6080 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 400×600×90 mm envelope of 6080 gives a D/d ratio of 1.50 and 100.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 565/825 kN load ratings, 26.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 930 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 87600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6080 on the 400×600×90 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6080 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6080 is listed." ], "faq": [ { "q": "What are the dimensions of a 6080 bearing?", "a": "A 6080 deep-groove ball bearing has a 400 mm bore, 600 mm outer diameter and 90 mm width (15.748 × 23.622 × 3.543 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6080 have?", "a": "Unless a clearance suffix says otherwise, 6080 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6080 and verify the residual clearance after mounting." }, { "q": "How should 6080 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 400 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6080?", "a": "NTN lists the open 6080 under the bare designation 6080; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 400 mm bore envelope." }, { "q": "Does NTN offer 6080 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6080 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6080-M", "equiv_brand": "SKF", "level": "full", "note": "Same 400×600×90 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6080" ], "locale_variants": {} }, { "sku": "61884", "brand": "NTN", "manufacturer_designation": "6884", "series": "61800-series", "type": "deep_groove", "d_mm": 420, "D_mm": 520, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 288, "static_load_kN": 405, "fatigue_load_limit_kN": 12.4, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 21600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61884 carries bore code 84 = 420 mm. Outside diameter 520 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 420 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 420 mm of 61884 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 420 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6284.", "The open 61884 has no lubricant retention: grease escapes and contaminants migrate straight into the 420×520×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61884 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 420 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 46 mm-wide ring of 61884 drags the lip and overheats it.", "The open 61884 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 420 mm bore places 61884 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at 1000 r/min for 61884; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61884 at 288 kN dynamic (C) and 405 kN static (C0), 12.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 21600 g (21.6 kg), 61884 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 420×520×46 mm envelope of 61884 gives a D/d ratio of 1.24 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 288/405 kN load ratings, 12.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 1000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 21600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6884 on the 420×520×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61884 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61884 bearing?", "a": "A 61884 deep-groove ball bearing has a 420 mm bore, 520 mm outer diameter and 46 mm width (16.535 × 20.472 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61884 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61884 uses the same ISO 15 envelope (420×520×46 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61884 have?", "a": "Unless a clearance suffix says otherwise, 61884 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61884 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61884?", "a": "NTN lists the open 61884 under the bare designation 6884; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 420 mm bore envelope." }, { "q": "Does NTN offer 61884 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6884 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61884-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 420×520×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6884", "61884" ], "locale_variants": {} }, { "sku": "61984", "brand": "NTN", "manufacturer_designation": "6984", "series": "61900-series", "type": "deep_groove", "d_mm": 420, "D_mm": 560, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 380, "static_load_kN": 560, "fatigue_load_limit_kN": 16.8, "limiting_speed_rpm": 940, "max_rpm": 940, "weight_g": 43400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61984 carries bore code 84 = 420 mm. Outside diameter 560 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 420 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 420 mm bore the ring mass is significant: heat 61984 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (70.0 mm section height at 420 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61984 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61984 units.", "Never mix components between two 61984 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 65 mm-wide ring of 61984 drags the lip and overheats it.", "The open 61984 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 420 mm bore places 61984 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 940 r/min for 61984; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61984 at 380 kN dynamic (C) and 560 kN static (C0), 16.8 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 43400 g (43.4 kg), 61984 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 420×560×65 mm envelope of 61984 gives a D/d ratio of 1.33 and only 70.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 380/560 kN load ratings, 16.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 940 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 43400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6984 on the 420×560×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61984 in a rated drive.", "Order the C3 internal-clearance version (61984 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61984 bearing?", "a": "A 61984 deep-groove ball bearing has a 420 mm bore, 560 mm outer diameter and 65 mm width (16.535 × 22.047 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61984 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 420 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61984 need?", "a": "The open 61984 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61984?", "a": "NTN lists the open 61984 under the bare designation 6984; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 420 mm bore envelope." }, { "q": "Is 6984 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61984-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 420×560×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6984", "61984" ], "locale_variants": {} }, { "sku": "6084", "brand": "NTN", "manufacturer_designation": "6084", "series": "6000-series", "type": "deep_groove", "d_mm": 420, "D_mm": 620, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 590, "static_load_kN": 895, "fatigue_load_limit_kN": 28.3, "limiting_speed_rpm": 880, "max_rpm": 880, "weight_g": 91100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6084 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 84 by five gives the 420 mm bore; the 620 mm outside diameter and 90 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 420 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 420 mm of 6084 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 420 mm bore uses a smaller 620 mm OD than a 6284; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6084 has no lubricant retention: grease escapes and contaminants migrate straight into the 420×620×90 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6084 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 620 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6084.", "The open 6084 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 420 mm bore places 6084 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 880 r/min for 6084; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 590 kN dynamic load rating (C) and 895 kN static (C0), 28.3 kN fatigue load limit Cu, 6084 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 91100 g (91.1 kg), 6084 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 420×620×90 mm envelope of 6084 gives a D/d ratio of 1.48 and 100.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 590/895 kN load ratings, 28.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 880 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 91100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6084 on the 420×620×90 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6084 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6084 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6084 bearing?", "a": "A 6084 deep-groove ball bearing has a 420 mm bore, 620 mm outer diameter and 90 mm width (16.535 × 24.409 × 3.543 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6084 mean?", "a": "A bare 6084 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 420 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (620×90 mm, 100.0 mm radial section) at 420 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN order number for an open 6084?", "a": "NTN lists the open 6084 under the bare designation 6084; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 420 mm bore envelope." }, { "q": "What cage does NTN fit in 6084?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6084-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 420×620×90 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6084" ], "locale_variants": {} }, { "sku": "61888", "brand": "NTN", "manufacturer_designation": "6888", "series": "61800-series", "type": "deep_groove", "d_mm": 440, "D_mm": 540, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 292, "static_load_kN": 420, "fatigue_load_limit_kN": 12.6, "limiting_speed_rpm": 950, "max_rpm": 950, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61888 carries bore code 88 = 440 mm. Outside diameter 540 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 440 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 440 mm bore the ring mass is significant: heat 61888 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 440 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6288.", "The open 61888 has no lubricant retention: grease escapes and contaminants migrate straight into the 440×540×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61888 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "A 440 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61888 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 440 mm bore places 61888 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 950 r/min for 61888; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61888 at 292 kN dynamic (C) and 420 kN static (C0), 12.6 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 22500 g (22.5 kg), 61888 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 440×540×46 mm envelope of 61888 gives a D/d ratio of 1.23 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 292/420 kN load ratings, 12.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 950 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 22500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6888 on the 440×540×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61888 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61888 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61888 bearing?", "a": "A 61888 deep-groove ball bearing has a 440 mm bore, 540 mm outer diameter and 46 mm width (17.323 × 21.26 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61888 bore code work?", "a": "The last two digits of 61888 are bore code 88, giving 88 × 5 = 440 mm bore. The 540 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61888 mean?", "a": "A bare 61888 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 61888?", "a": "NTN lists the open 61888 under the bare designation 6888; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 440 mm bore envelope." }, { "q": "What cage does NTN fit in 6888?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61888-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 440×540×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6888", "61888" ], "locale_variants": {} }, { "sku": "61988", "brand": "NTN", "manufacturer_designation": "6988", "series": "61900-series", "type": "deep_groove", "d_mm": 440, "D_mm": 600, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 405, "static_load_kN": 615, "fatigue_load_limit_kN": 18, "limiting_speed_rpm": 890, "max_rpm": 890, "weight_g": 60000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61988 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 88 by five gives the 440 mm bore; the 600 mm outside diameter and 74 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 440 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 440 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (80.0 mm section height at 440 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61988 has no lubricant retention: grease escapes and contaminants migrate straight into the 440×600×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61988 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 74 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61988 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 440 mm bore places 61988 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 890 r/min for 61988; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 405 kN dynamic load rating (C) and 615 kN static (C0), 18 kN fatigue load limit Cu, 61988 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 60000 g (60.0 kg), 61988 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 440×600×74 mm envelope of 61988 gives a D/d ratio of 1.36 and only 80.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 405/615 kN load ratings, 18 kN fatigue load limit Cu NTN lists the grease limiting speed at 890 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 60000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6988 on the 440×600×74 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61988 in a rated drive.", "Standard catalogue stock of 61988 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61988 bearing?", "a": "A 61988 deep-groove ball bearing has a 440 mm bore, 600 mm outer diameter and 74 mm width (17.323 × 23.622 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61988 have?", "a": "Unless a clearance suffix says otherwise, 61988 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61988 and verify the residual clearance after mounting." }, { "q": "How should 61988 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 440 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61988?", "a": "NTN lists the open 61988 under the bare designation 6988; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 440 mm bore envelope." }, { "q": "Is 6988 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61988-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 440×600×74 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6988", "61988" ], "locale_variants": {} }, { "sku": "61892", "brand": "NTN", "manufacturer_designation": "6892", "series": "61800-series", "type": "deep_groove", "d_mm": 460, "D_mm": 580, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 350, "static_load_kN": 515, "fatigue_load_limit_kN": 15.1, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 34800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61892 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 92 by five gives the 460 mm bore; the 580 mm outside diameter and 56 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 460 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 460 mm bore the ring mass is significant: heat 61892 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 60.0 mm of radial section separates bore and OD on the 618xx series at 460 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6292.", "The open 61892 has no lubricant retention: grease escapes and contaminants migrate straight into the 460×580×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61892 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61892-C3. No clearance suffix means normal CN clearance.", "The open 61892 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 460 mm bore places 61892 near the top of NTN's single-row deep-groove range; the pressed-steel cage is not viable at this diameter and NTN supplies a machined brass cage (suffix M). Housing stiffness and shaft alignment are critical, and the grease limiting speed is very low — specify oil lubrication and confirm the relubrication interval with NTN engineering.", "NTN lists the grease limiting speed at only 900 r/min for 61892; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61892 at 350 kN dynamic (C) and 515 kN static (C0), 15.1 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 34800 g (34.8 kg), 61892 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 460×580×56 mm envelope of 61892 gives a D/d ratio of 1.26 and only 60.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 350/515 kN load ratings, 15.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 34800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6892 on the 460×580×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61892 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61892 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61892 bearing?", "a": "A 61892 deep-groove ball bearing has a 460 mm bore, 580 mm outer diameter and 56 mm width (18.11 × 22.835 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61892 bore code work?", "a": "The last two digits of 61892 are bore code 92, giving 92 × 5 = 460 mm bore. The 580 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61892 mean?", "a": "A bare 61892 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 61892?", "a": "NTN lists the open 61892 under the bare designation 6892; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 460 mm bore envelope." }, { "q": "Is 6892 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61892-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 460×580×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6892", "61892" ], "locale_variants": {} }, { "sku": "61992", "brand": "NTN", "manufacturer_designation": "6992", "series": "61900-series", "type": "deep_groove", "d_mm": 460, "D_mm": 620, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 415, "static_load_kN": 645, "fatigue_load_limit_kN": 18.5, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 62200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61992 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 92 by five gives the 460 mm bore; the 620 mm outside diameter and 74 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 460 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 460 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 460 mm bore (80.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61992 has no lubricant retention: grease escapes and contaminants migrate straight into the 460×620×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61992 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 620 mm OD should be round within IT7; an oval bore pinches the outer ring of 61992 and shows up later as two-point loaded raceway wear.", "Never mix components between two 61992 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61992 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 460 mm bore places 61992 near the top of NTN's single-row deep-groove range; the pressed-steel cage is not viable at this diameter and NTN supplies a machined brass cage (suffix M). Housing stiffness and shaft alignment are critical, and the grease limiting speed is very low — specify oil lubrication and confirm the relubrication interval with NTN engineering.", "NTN lists the grease limiting speed at only 850 r/min for 61992; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 415 kN dynamic load rating (C) and 645 kN static (C0), 18.5 kN fatigue load limit Cu, 61992 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 62200 g (62.2 kg), 61992 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 460×620×74 mm envelope of 61992 gives a D/d ratio of 1.35 and only 80.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 415/645 kN load ratings, 18.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 850 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 62200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6992 on the 460×620×74 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61992 in a rated drive.", "Standard catalogue stock of 61992 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61992 bearing?", "a": "A 61992 deep-groove ball bearing has a 460 mm bore, 620 mm outer diameter and 74 mm width (18.11 × 24.409 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61992 need?", "a": "The open 61992 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61992 bore code work?", "a": "The last two digits of 61992 are bore code 92, giving 92 × 5 = 460 mm bore. The 620 mm outside diameter and 74 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61992?", "a": "NTN lists the open 61992 under the bare designation 6992; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 460 mm bore envelope." }, { "q": "Is 6992 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61992-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 460×620×74 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6992", "61992" ], "locale_variants": {} }, { "sku": "61896", "brand": "NTN", "manufacturer_designation": "6896", "series": "61800-series", "type": "deep_groove", "d_mm": 480, "D_mm": 600, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 355, "static_load_kN": 540, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 860, "max_rpm": 860, "weight_g": 36200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61896 carries bore code 96 = 480 mm. Outside diameter 600 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 480 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 480 mm bore the ring mass is significant: heat 61896 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 60.0 mm of radial section separates bore and OD on the 618xx series at 480 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6296.", "Storage matters for open bearings: 61896 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61896 units.", "Shaft and housing fillets must clear the bearing chamfer so the 56 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The housing bore for the 600 mm OD should be round within IT7; an oval bore pinches the outer ring of 61896 and shows up later as two-point loaded raceway wear.", "The open 61896 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 480 mm bore places 61896 near the top of NTN's single-row deep-groove range; the pressed-steel cage is not viable at this diameter and NTN supplies a machined brass cage (suffix M). Housing stiffness and shaft alignment are critical, and the grease limiting speed is very low — specify oil lubrication and confirm the relubrication interval with NTN engineering.", "NTN lists the grease limiting speed at only 860 r/min for 61896; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61896 at 355 kN dynamic (C) and 540 kN static (C0), 15.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 36200 g (36.2 kg), 61896 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 480×600×56 mm envelope of 61896 gives a D/d ratio of 1.25 and only 60.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 355/540 kN load ratings, 15.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 860 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 36200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6896 on the 480×600×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61896 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61896 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61896 bearing?", "a": "A 61896 deep-groove ball bearing has a 480 mm bore, 600 mm outer diameter and 56 mm width (18.898 × 23.622 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 480 mm bore?", "a": "618 is an extra-thin section: 600×56 mm, only 60.0 mm radial section at 480 mm bore, far smaller than a 6296, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61896 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61896 uses the same ISO 15 envelope (480×600×56 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61896?", "a": "NTN lists the open 61896 under the bare designation 6896; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 480 mm bore envelope." }, { "q": "What cage does NTN fit in 6896?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61896-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 480×600×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6896", "61896" ], "locale_variants": {} }, { "sku": "61996", "brand": "NTN", "manufacturer_designation": "6996", "series": "61900-series", "type": "deep_groove", "d_mm": 480, "D_mm": 650, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 480, "static_load_kN": 770, "fatigue_load_limit_kN": 21.5, "limiting_speed_rpm": 810, "max_rpm": 810, "weight_g": 73000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61996 carries bore code 96 = 480 mm. Outside diameter 650 mm and width 78 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 480 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 480 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (85.0 mm section height at 480 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61996 has no lubricant retention: grease escapes and contaminants migrate straight into the 480×650×78 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61996 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61996-C3. No clearance suffix means normal CN clearance.", "The open 61996 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 480 mm bore places 61996 near the top of NTN's single-row deep-groove range; the pressed-steel cage is not viable at this diameter and NTN supplies a machined brass cage (suffix M). Housing stiffness and shaft alignment are critical, and the grease limiting speed is very low — specify oil lubrication and confirm the relubrication interval with NTN engineering.", "NTN lists the grease limiting speed at only 810 r/min for 61996; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 480 kN dynamic load rating (C) and 770 kN static (C0), 21.5 kN fatigue load limit Cu, 61996 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 73000 g (73.0 kg), 61996 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 480×650×78 mm envelope of 61996 gives a D/d ratio of 1.35 and only 85.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 480/770 kN load ratings, 21.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 810 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 73000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6996 on the 480×650×78 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61996 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61996 bearing?", "a": "A 61996 deep-groove ball bearing has a 480 mm bore, 650 mm outer diameter and 78 mm width (18.898 × 25.591 × 3.071 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61996 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61996 uses the same ISO 15 envelope (480×650×78 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61996 have?", "a": "Unless a clearance suffix says otherwise, 61996 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61996 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61996?", "a": "NTN lists the open 61996 under the bare designation 6996; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 480 mm bore envelope." }, { "q": "What cage does NTN fit in 6996?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61996-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 480×650×78 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6996", "61996" ], "locale_variants": {} }, { "sku": "6200", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 31, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6200 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 30 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Miniature bearings like 6200 (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6300 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.", "The open 6200 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×30×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6200 units.", "The housing bore for the 30 mm OD should be round within IT7; an oval bore pinches the outer ring of 6200 and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6200 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6200-2Z (shields) and 6200-2RSH (contact seals), not suffix-free 6200.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200 bearing?", "a": "A 6200 deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6200 have?", "a": "Unless a clearance suffix says otherwise, 6200 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6200 and verify the residual clearance after mounting." }, { "q": "How should 6200 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6200 need?", "a": "The open 6200 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6200?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200 — the open (unsealed) execution, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 36000 r/min, mass 31 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6200." } ], "cross_ref": [ { "equiv_sku": "6200-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6200-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7200", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2RS1 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2Z shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6200", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6200-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 30 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6200-2Z.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Codes 00–03 are the exception series: 6200 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "At 10 mm bore the 62xx light series is the workhorse section; its 30×9 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6200-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6200-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6200-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6200-2Z (one shield: 6200-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6200-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6200-2Z for high-contamination positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-ZZ bearing?", "a": "A 6200-ZZ deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6200-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6200-ZZ need?", "a": "6200-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6200-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2Z — two non-contact sheet-metal shields, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 28000 r/min, mass 34 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6200-ZZ." } ], "cross_ref": [ { "equiv_sku": "6200-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7200", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2RS1 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2Z shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6200-2Z", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6200-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 30 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6200-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Miniature bearings like 6200-2RS (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "At 10 mm bore the 62xx light series is the workhorse section; its 30×9 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6200-2RS runs slower and cooler-limited than the open 6200; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6200-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6200-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 6200-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 6200-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed. The single-seal catalogue number is 6200-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6200-RSH exists for arrangements that lubricate through the open side; fitting 6200-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-2RS bearing?", "a": "A 6200-2RS deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6200-2RS need?", "a": "6200-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6200 with a housing grease fitting instead." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6200-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6200-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2RSH — two contact elastomer seals over a lifetime grease fill, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 17000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6200-2RS." } ], "cross_ref": [ { "equiv_sku": "6200-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6200-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7200", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2RS1 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2Z shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6200-2RSH", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6201 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 32 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "The open 6201 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×32×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6201 units.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6201 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6201-2Z (shields) and 6201-2RSH (contact seals), not suffix-free 6201.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201 bearing?", "a": "A 6201 deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6201 have?", "a": "Unless a clearance suffix says otherwise, 6201 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6201 and verify the residual clearance after mounting." }, { "q": "How should 6201 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6201 need?", "a": "The open 6201 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6201?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201 — the open (unsealed) execution, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 32000 r/min, mass 37 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6201." } ], "cross_ref": [ { "equiv_sku": "6201-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7201", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2RS1 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2Z shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6201", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6201-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 32 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6201-2Z.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Miniature bearings like 6201-ZZ (12 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "At 12 mm bore the 62xx light series is the workhorse section; its 32×10 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6201-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6201-2RS for that.", "Do not wash 6201-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6201-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6201-2Z (one shield: 6201-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6201-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6201-2Z for high-contamination positions.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-ZZ bearing?", "a": "A 6201-ZZ deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6201 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6201 uses the same ISO 15 envelope (12×32×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6201-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6201-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6201 and verify the residual clearance after mounting." }, { "q": "How should 6201-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6201-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2Z — two non-contact sheet-metal shields, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 26000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6201-ZZ." } ], "cross_ref": [ { "equiv_sku": "6201-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7201", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2RS1 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2Z shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6201-2Z", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6201-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6201-2RS runs slower and cooler-limited than the open 6201; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6201-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 6201-2RS and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6201-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 15000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6201-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6201-RSH exists for arrangements that lubricate through the open side; fitting 6201-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-2RS bearing?", "a": "A 6201-2RS deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6201 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6201 uses the same ISO 15 envelope (12×32×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6201-2RS have?", "a": "Unless a clearance suffix says otherwise, 6201-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6201 and verify the residual clearance after mounting." }, { "q": "How should 6201-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6201-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2RSH — two contact elastomer seals over a lifetime grease fill, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 15000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6201-2RS." } ], "cross_ref": [ { "equiv_sku": "6201-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7201", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2RS1 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2Z shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6201-2RSH", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6202 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6202 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6202 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 11 mm-wide ring of 6202 drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6202.", "The open 6202 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6202-2Z (shields) and 6202-2RSH (contact seals), not suffix-free 6202.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202 bearing?", "a": "A 6202 deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6202 mean?", "a": "A bare 6202 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "Are 6202 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6202 uses the same ISO 15 envelope (15×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6202?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202 — the open (unsealed) execution, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 28000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6202." } ], "cross_ref": [ { "equiv_sku": "6202-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7202", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2RS1 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2Z shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6202", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 48, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6202-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6202-2Z.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "At 15 mm bore the 62xx light series is the workhorse section; its 35×11 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6202-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6202-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6202-ZZ.", "SKF spells the shielded version 6202-2Z (one shield: 6202-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6202-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6202-2Z for high-contamination positions.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-ZZ bearing?", "a": "A 6202-ZZ deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6202-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6202-ZZ need?", "a": "6202-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6202-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2Z — two non-contact sheet-metal shields, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 22000 r/min, mass 48 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6202-ZZ." } ], "cross_ref": [ { "equiv_sku": "6202-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7202", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2RS1 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2Z shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6202-2Z", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 46, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6202-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Miniature bearings like 6202-2RS (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "At 15 mm bore the 62xx light series is the workhorse section; its 35×11 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6202-2RS runs slower and cooler-limited than the open 6202; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6202-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6202-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 11 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6202-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 43000 r/min thermal reference speed. The single-seal catalogue number is 6202-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6202-RSH exists for arrangements that lubricate through the open side; fitting 6202-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-2RS bearing?", "a": "A 6202-2RS deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6202-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "Are 6202 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6202 uses the same ISO 15 envelope (15×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6202-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2RSH — two contact elastomer seals over a lifetime grease fill, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 13000 r/min, mass 46 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6202-2RS." } ], "cross_ref": [ { "equiv_sku": "6202-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7202", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2RS1 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2Z shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6202-2RSH", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 65, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6203 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6203 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×40×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6203 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6203 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6203-2Z (shields) and 6203-2RSH (contact seals), not suffix-free 6203.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203 bearing?", "a": "A 6203 deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6203 mean?", "a": "A bare 6203 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with an 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "Are 6203 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6203 uses the same ISO 15 envelope (17×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6203?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203 — the open (unsealed) execution, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 24000 r/min, mass 65 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6203." } ], "cross_ref": [ { "equiv_sku": "6203-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7203", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726203-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726203-2RS1 is a standard-inner-ring insert on the same 17x40x12 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2RS1 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2Z shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6203", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 68, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6203-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6203-2Z.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6203-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6203-2RS for that.", "Shielded 6203-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 40 mm OD should be round within IT7; an oval bore pinches the outer ring of 6203-ZZ and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 6203-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6203-2Z (one shield: 6203-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6203-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6203-2Z for high-contamination positions.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-ZZ bearing?", "a": "A 6203-ZZ deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6203-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with an 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "Are 6203 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6203 uses the same ISO 15 envelope (17×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6203-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2Z — two non-contact sheet-metal shields, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 19000 r/min, mass 68 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6203-ZZ." } ], "cross_ref": [ { "equiv_sku": "6203-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7203", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2RS1 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2Z shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6203-2Z", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6203-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6203-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6203-2RS runs slower and cooler-limited than the open 6203; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6203-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6203-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6203-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6203-RSH exists for arrangements that lubricate through the open side; fitting 6203-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-2RS bearing?", "a": "A 6203-2RS deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6203-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6203-2RS need?", "a": "6203-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6203 with a housing grease fitting instead." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6203-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2RSH — two contact elastomer seals over a lifetime grease fill, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 12000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6203-2RS." } ], "cross_ref": [ { "equiv_sku": "6203-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7203", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2RS1 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2Z shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6203-2RSH", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6204 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 20 mm bore the 62xx light series is the workhorse section; its 47×14 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6204 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6204 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6204 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6204 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6204-2Z (shields) and 6204-2RSH (contact seals), not suffix-free 6204.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204 bearing?", "a": "A 6204 deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6204 bore code work?", "a": "The last two digits of 6204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6204 mean?", "a": "A bare 6204 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6204?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204 — the open (unsealed) execution, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 20000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6204." } ], "cross_ref": [ { "equiv_sku": "6204-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726204-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726204-2RS1 is a standard-inner-ring insert on the same 20x47x14 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2RS1 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2Z shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6204", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6204-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6204-ZZ.", "At 20 mm bore the 62xx light series is the workhorse section; its 47×14 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6204-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6204-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 14 mm-wide ring of 6204-ZZ drags the lip and overheats it.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 47 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6204-ZZ.", "SKF spells the shielded version 6204-2Z (one shield: 6204-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6204-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6204-2Z for high-contamination positions.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-ZZ bearing?", "a": "A 6204-ZZ deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "Are 6204 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6204 uses the same ISO 15 envelope (20×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6204-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6204-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6204 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6204-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2Z — two non-contact sheet-metal shields, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 17000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6204-ZZ." } ], "cross_ref": [ { "equiv_sku": "6204-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2RS1 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2Z shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6204-2Z", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6204-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 20 mm shaft for 6204 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6204-2RS runs slower and cooler-limited than the open 6204; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6204-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6204-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6204-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 10000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed. The single-seal catalogue number is 6204-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6204-RSH exists for arrangements that lubricate through the open side; fitting 6204-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-2RS bearing?", "a": "A 6204-2RS deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "Are 6204 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6204 uses the same ISO 15 envelope (20×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6204-2RS have?", "a": "Unless a clearance suffix says otherwise, 6204-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6204 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6204-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2RSH — two contact elastomer seals over a lifetime grease fill, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 10000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6204-2RS." } ], "cross_ref": [ { "equiv_sku": "6204-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2RS1 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2Z shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6204-2RSH", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6205.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "The open 6205 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6205 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 52 mm OD should be round within IT7; an oval bore pinches the outer ring of 6205 and shows up later as two-point loaded raceway wear.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6205 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6205-2Z (shields) and 6205-2RSH (contact seals), not suffix-free 6205.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205 bearing?", "a": "A 6205 deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6205 mean?", "a": "A bare 6205 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "Are 6205 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6205 uses the same ISO 15 envelope (25×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6205?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205 — the open (unsealed) execution, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 18000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6205." } ], "cross_ref": [ { "equiv_sku": "6205-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726205-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726205-2RS1 is a standard-inner-ring insert on the same 25x52x15 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2RS1 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2Z shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6205", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6205-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6205-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 25 mm bore the 62xx light series is the workhorse section; its 52×15 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6205-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6205-2RS for that.", "Shielded 6205-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6205-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6205-ZZ.", "SKF spells the shielded version 6205-2Z (one shield: 6205-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6205-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6205-2Z for high-contamination positions.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-ZZ bearing?", "a": "A 6205-ZZ deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "Are 6205 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6205 uses the same ISO 15 envelope (25×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6205-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6205-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6205 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6205-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2Z — two non-contact sheet-metal shields, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 14000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6205-ZZ." } ], "cross_ref": [ { "equiv_sku": "6205-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2RS1 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2Z shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6205-2Z", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6205-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6205-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6205-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6205-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Measure the shaft, do not trust the drawing: a 25 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6205-2RS.", "SKF catalogues the contact-sealed version as 6205-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 28000 r/min thermal reference speed. The single-seal catalogue number is 6205-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6205-RSH exists for arrangements that lubricate through the open side; fitting 6205-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-2RS bearing?", "a": "A 6205-2RS deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6205-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6205-2RS need?", "a": "6205-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6205 with a housing grease fitting instead." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6205-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2RSH — two contact elastomer seals over a lifetime grease fill, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 8500 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6205-2RS." } ], "cross_ref": [ { "equiv_sku": "6205-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2RS1 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2Z shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6205-2RSH", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "The open 6206 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×62×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6206 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 6206 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 6206 and shows up later as two-point loaded raceway wear.", "The open 6206 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6206-2Z (shields) and 6206-2RSH (contact seals), not suffix-free 6206.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206 bearing?", "a": "A 6206 deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6206 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6206 need?", "a": "The open 6206 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6206?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206 — the open (unsealed) execution, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 15000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6206." } ], "cross_ref": [ { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726206-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726206-2RS1 is a standard-inner-ring insert on the same 30x62x16 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2RS1 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2Z shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206 shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206-2Z shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6206", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6206-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 30 mm shaft for 6206 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "At 30 mm bore the 62xx light series is the workhorse section; its 62×16 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6206-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6206-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 6206-ZZ and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6206-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6206-2Z (one shield: 6206-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6206-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6206-2Z for high-contamination positions.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-ZZ bearing?", "a": "A 6206-ZZ deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6206 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6206 uses the same ISO 15 envelope (30×62×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6206-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6206-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6206 and verify the residual clearance after mounting." }, { "q": "How should 6206-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6206-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2Z — two non-contact sheet-metal shields, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 12000 r/min, mass 210 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6206-ZZ." } ], "cross_ref": [ { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2RS1 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2Z shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206 shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206-2Z shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6206-2Z", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6206-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 62 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6206-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 30 mm shaft for 6206 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "At 30 mm bore the 62xx light series is the workhorse section; its 62×16 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6206-2RS runs slower and cooler-limited than the open 6206; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6206-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6206-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6206-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6206-RSH exists for arrangements that lubricate through the open side; fitting 6206-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-2RS bearing?", "a": "A 6206-2RS deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6206-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6206-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2RSH — two contact elastomer seals over a lifetime grease fill, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 7500 r/min, mass 210 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6206-2RS." } ], "cross_ref": [ { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2RS1 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2Z shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206 shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206-2Z shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6206-2RSH", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 35 mm shaft for 6207 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "At 35 mm bore the 62xx light series is the workhorse section; its 72×17 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6207 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×72×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6207 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 6207 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6207-C3. No clearance suffix means normal CN clearance.", "The open 6207 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6207-2Z (shields) and 6207-2RSH (contact seals), not suffix-free 6207.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207 bearing?", "a": "A 6207 deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6207 bore code work?", "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6207 mean?", "a": "A bare 6207 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with an 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6207?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207 — the open (unsealed) execution, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 13000 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6207." } ], "cross_ref": [ { "equiv_sku": "6207-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726207-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726207-2RS1 is a standard-inner-ring insert on the same 35x72x17 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2RS1 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2Z shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "207", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207 shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207-2Z shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6207", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6207-2Z.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6207-ZZ.", "At 35 mm bore the 62xx light series is the workhorse section; its 72×17 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6207-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6207-2RS for that.", "Shielded 6207-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6207-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6207-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6207-2Z (one shield: 6207-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6207-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6207-2Z for high-contamination positions.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207-ZZ bearing?", "a": "A 6207-ZZ deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6207 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6207 uses the same ISO 15 envelope (35×72×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6207-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6207-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6207 and verify the residual clearance after mounting." }, { "q": "How should 6207-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6207-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207-2Z — two non-contact sheet-metal shields, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 10000 r/min, mass 300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6207-ZZ." } ], "cross_ref": [ { "equiv_sku": "6207-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2RS1 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2Z shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "207", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207 shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207-2Z shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6207-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6207-2Z", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6207-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6207-2RS runs slower and cooler-limited than the open 6207; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6207-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6207-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6207-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6207-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6207-RSH exists for arrangements that lubricate through the open side; fitting 6207-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207-2RS bearing?", "a": "A 6207-2RS deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6207-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with an 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "Are 6207 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6207 uses the same ISO 15 envelope (35×72×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6207-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207-2RSH — two contact elastomer seals over a lifetime grease fill, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 6300 r/min, mass 300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6207-2RS." } ], "cross_ref": [ { "equiv_sku": "6207-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2RS1 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2Z shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "207", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207 shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207-2Z shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6207-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6207-2RSH", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 40 mm bore the 62xx light series is the workhorse section; its 80×18 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6208 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×80×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6208 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6208 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6208-2Z (shields) and 6208-2RSH (contact seals), not suffix-free 6208.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208 bearing?", "a": "A 6208 deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6208 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6208 need?", "a": "The open 6208 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6208?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208 — the open (unsealed) execution, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 11000 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6208." } ], "cross_ref": [ { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726208-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726208-2RS1 is a standard-inner-ring insert on the same 40x80x18 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2RS1 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2Z shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208 shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208-2Z shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6208", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6208-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6208-ZZ.", "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6208-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6208-2RS for that.", "Shielded 6208-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 6208-ZZ and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6208-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6208-2Z (one shield: 6208-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6208-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6208-2Z for high-contamination positions.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-ZZ bearing?", "a": "A 6208-ZZ deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6208-ZZ need?", "a": "6208-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6208-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6208-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2Z — two non-contact sheet-metal shields, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 9000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6208-ZZ." } ], "cross_ref": [ { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2RS1 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2Z shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208 shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208-2Z shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6208-2Z", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6208-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 40 mm shaft for 6208 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "At 40 mm bore the 62xx light series is the workhorse section; its 80×18 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Heat is the enemy of the sealed 6208-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6208-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6208-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 6208-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 18000 r/min thermal reference speed. The single-seal catalogue number is 6208-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6208-RSH exists for arrangements that lubricate through the open side; fitting 6208-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-2RS bearing?", "a": "A 6208-2RS deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6208-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 40 mm bore?", "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated." }, { "q": "Are 6208 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6208 uses the same ISO 15 envelope (40×80×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6208-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2RSH — two contact elastomer seals over a lifetime grease fill, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 5600 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6208-2RS." } ], "cross_ref": [ { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2RS1 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2Z shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208 shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208-2Z shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6208-2RSH", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6209.", "At 45 mm bore the 62xx light series is the workhorse section; its 85×19 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6209 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×85×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6209 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6209 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6209-2Z (shields) and 6209-2RSH (contact seals), not suffix-free 6209.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209 bearing?", "a": "A 6209 deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6209 need?", "a": "The open 6209 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6209 mean?", "a": "A bare 6209 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6209?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209 — the open (unsealed) execution, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.915 kN, limiting speed 11000 r/min, mass 420 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6209." } ], "cross_ref": [ { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6209-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6209-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726209-B-2RS1-VP274", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726209B-2RS1/VP274 is a standard-inner-ring insert on the same 45x85x19 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "1726209-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726209-2RS1 is a standard-inner-ring insert on the same 45x85x19 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2RS1 shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2Z shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209 shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209-2Z shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6209", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6209-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6209-ZZ.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "Do not wash 6209-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6209-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 85 mm OD should be round within IT7; an oval bore pinches the outer ring of 6209-ZZ and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 85 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6209-ZZ.", "SKF spells the shielded version 6209-2Z (one shield: 6209-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6209-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6209-2Z for high-contamination positions.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209-ZZ bearing?", "a": "A 6209-ZZ deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6209-ZZ need?", "a": "6209-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6209-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6209-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209-2Z — two non-contact sheet-metal shields, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.92 kN, limiting speed 8500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6209-ZZ." } ], "cross_ref": [ { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6209-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2RS1 shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2Z shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209 shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209-2Z shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6209-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6209-2Z", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.92, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6209-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "A 45 mm shaft for 6209 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "At 45 mm bore the 62xx light series is the workhorse section; its 85×19 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6209-2RS runs slower and cooler-limited than the open 6209; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6209-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6209-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed. The single-seal catalogue number is 6209-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6209-RSH exists for arrangements that lubricate through the open side; fitting 6209-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209-2RS bearing?", "a": "A 6209-2RS deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6209-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6209-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209-2RSH — two contact elastomer seals over a lifetime grease fill, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.915 kN, limiting speed 5000 r/min, mass 420 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6209-2RS." } ], "cross_ref": [ { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6209-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6209-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2RS1 shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2Z shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209 shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209-2Z shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6209-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6209-2RSH", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.915, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6210 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 90 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6210 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "The open 6210 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×90×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6210 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6210 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6210-2Z (shields) and 6210-2RSH (contact seals), not suffix-free 6210.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210 bearing?", "a": "A 6210 deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6210 mean?", "a": "A bare 6210 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6210?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210 — the open (unsealed) execution, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 10000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6210." } ], "cross_ref": [ { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6210-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6210-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726210-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726210-2RS1 is a standard-inner-ring insert on the same 50x90x20 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6210 M (machined brass cage, open arrangement) is the same-size execution on the 50×90×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2RS1 shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2Z shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210 shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210-2Z shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6210", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 470, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6210-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 90 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6210-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6210 with C3 clearance and re-check the residual value after mounting.", "At 50 mm bore the 62xx light series is the workhorse section; its 90×20 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6210-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6210-2RS for that.", "Do not wash 6210-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6210-ZZ.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6210-2Z (one shield: 6210-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6210-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6210-2Z for high-contamination positions.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210-ZZ bearing?", "a": "A 6210-ZZ deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6210 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6210 uses the same ISO 15 envelope (50×90×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6210-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6210-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6210 and verify the residual clearance after mounting." }, { "q": "How should 6210-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6210-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210-2Z — two non-contact sheet-metal shields, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 8000 r/min, mass 470 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6210-ZZ." } ], "cross_ref": [ { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6210-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6210 M (machined brass cage, open arrangement) is the same-size execution on the 50×90×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2RS1 shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2Z shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210 shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210-2Z shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6210-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6210-2Z", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6210-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6210 with C3 clearance and re-check the residual value after mounting.", "At 50 mm bore the 62xx light series is the workhorse section; its 90×20 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6210-2RS runs slower and cooler-limited than the open 6210; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6210-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6210-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6210-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6210-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6210-RSH exists for arrangements that lubricate through the open side; fitting 6210-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210-2RS bearing?", "a": "A 6210-2RS deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6210-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6210-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210-2RSH — two contact elastomer seals over a lifetime grease fill, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 4800 r/min, mass 460 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6210-2RS." } ], "cross_ref": [ { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6210-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6210-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6210 M (machined brass cage, open arrangement) is the same-size execution on the 50×90×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2RS1 shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2Z shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210 shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210-2Z shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6210-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6210-2RSH", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6211 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 100 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6211 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "The open 6211 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×100×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6211 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 21 mm-wide ring of 6211 drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6211 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6211-2Z (shields) and 6211-2RSH (contact seals), not suffix-free 6211.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211 bearing?", "a": "A 6211 deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6211 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6211 uses the same ISO 15 envelope (55×100×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6211 have?", "a": "Unless a clearance suffix says otherwise, 6211 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6211 and verify the residual clearance after mounting." }, { "q": "How should 6211 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6211?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211 — the open (unsealed) execution, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 9000 r/min, mass 610 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6211." } ], "cross_ref": [ { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726211-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726211-2RS1 is a standard-inner-ring insert on the same 55x100x21 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6211 M (machined brass cage, open arrangement) is the same-size execution on the 55×100×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "211", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211 shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211-2Z shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6211", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6211-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "At 55 mm bore the 62xx light series is the workhorse section; its 100×21 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6211-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6211-2RS for that.", "Shielded 6211-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6211-2Z (one shield: 6211-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6211-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6211-2Z for high-contamination positions.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211-ZZ bearing?", "a": "A 6211-ZZ deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6211-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6211-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6211 and verify the residual clearance after mounting." }, { "q": "How should 6211-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6211-ZZ need?", "a": "6211-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6211-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211-2Z — two non-contact sheet-metal shields, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 7000 r/min, mass 640 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6211-ZZ." } ], "cross_ref": [ { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6211 M (machined brass cage, open arrangement) is the same-size execution on the 55×100×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "211", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211 shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211-2Z shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6211-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6211-2Z", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 620, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6211-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 100 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6211-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6211 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6211-2RS runs slower and cooler-limited than the open 6211; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6211-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 21 mm-wide ring of 6211-2RS drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6211-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed. The single-seal catalogue number is 6211-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6211-RSH exists for arrangements that lubricate through the open side; fitting 6211-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211-2RS bearing?", "a": "A 6211-2RS deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6211-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "Are 6211 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6211 uses the same ISO 15 envelope (55×100×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6211-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211-2RSH — two contact elastomer seals over a lifetime grease fill, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 4300 r/min, mass 620 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6211-2RS." } ], "cross_ref": [ { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6211 M (machined brass cage, open arrangement) is the same-size execution on the 55×100×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "211", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211 shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211-2Z shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6211-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6211-2RSH", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 780, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6212 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.", "The open 6212 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×110×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6212 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 6212 drags the lip and overheats it.", "The open 6212 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6212-2Z (shields) and 6212-2RSH (contact seals), not suffix-free 6212.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212 bearing?", "a": "A 6212 deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6212 mean?", "a": "A bare 6212 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "Are 6212 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6212 uses the same ISO 15 envelope (60×110×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6212?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212 — the open (unsealed) execution, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 8000 r/min, mass 780 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6212." } ], "cross_ref": [ { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6212-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6212-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726212-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726212-2RS1 is a standard-inner-ring insert on the same 60x110x22 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6212 M (machined brass cage, open arrangement) is the same-size execution on the 60×110×22 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "212", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212 shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212-2Z shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6212", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 810, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6212-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 110 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6212-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6212 with C3 clearance and re-check the residual value after mounting.", "At 60 mm bore the 62xx light series is the workhorse section; its 110×22 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6212-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6212-2RS for that.", "Shielded 6212-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 6212-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF spells the shielded version 6212-2Z (one shield: 6212-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6212-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6212-2Z for high-contamination positions.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212-ZZ bearing?", "a": "A 6212-ZZ deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6212 bore code work?", "a": "The last two digits of 6212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6212-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6212-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212-2Z — two non-contact sheet-metal shields, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 6300 r/min, mass 810 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6212-ZZ." } ], "cross_ref": [ { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6212-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6212-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6212 M (machined brass cage, open arrangement) is the same-size execution on the 60×110×22 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "212", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212 shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212-2Z shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6212-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6212-2Z", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 790, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6212-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6212 against the shaft shoulder while it cools so the ring cannot creep back.", "At 60 mm bore the 62xx light series is the workhorse section; its 110×22 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6212-2RS runs slower and cooler-limited than the open 6212; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6212-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6212-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6212-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6212-RSH exists for arrangements that lubricate through the open side; fitting 6212-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212-2RS bearing?", "a": "A 6212-2RS deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6212-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "Are 6212 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6212 uses the same ISO 15 envelope (60×110×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6212-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212-2RSH — two contact elastomer seals over a lifetime grease fill, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 4000 r/min, mass 790 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6212-2RS." } ], "cross_ref": [ { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6212-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6212-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6212 M (machined brass cage, open arrangement) is the same-size execution on the 60×110×22 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "212", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212 shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212-2Z shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6212-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6212-2RSH", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6213", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6213 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 120 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6213 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "The open 6213 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×120×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6213 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6213.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6213 drags the lip and overheats it.", "The open 6213 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6213-2Z (shields) and 6213-2RSH (contact seals), not suffix-free 6213.", "The 58.5/40.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6213 bearing?", "a": "A 6213 deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "Are 6213 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6213 uses the same ISO 15 envelope (65×120×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6213 have?", "a": "Unless a clearance suffix says otherwise, 6213 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6213 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6213?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6213 — the open (unsealed) execution, 65×120×23 mm per ISO 15. Quoted values: C 58.5 kN, C0 40.5 kN, Pu 1.73 kN, limiting speed 7500 r/min, mass 1000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6213." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6213-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6213-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6213-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6213-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6213-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6213-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "7213", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6213-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6213 M (machined brass cage, open arrangement) is the same-size execution on the 65×120×23 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "213", "equiv_brand": "SKF", "level": "partial", "note": "SKF 213 shares the 65×120×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 213-2Z shares the 65×120×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6213", "material": "GCr15", "dynamic_load_kN": 58.5, "static_load_kN": 40.5, "fatigue_load_limit_kN": 1.73, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6213-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6213-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 120 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6213-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.", "At 65 mm bore the 62xx light series is the workhorse section; its 120×23 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6213-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6213-2RS for that.", "Shielded 6213-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 120 mm OD should be round within IT7; an oval bore pinches the outer ring of 6213-ZZ and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 6213-2Z (one shield: 6213-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6213-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6213-2Z for high-contamination positions.", "The 58.5/40.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6213-ZZ bearing?", "a": "A 6213-ZZ deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6213-ZZ need?", "a": "6213-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6213 bore code work?", "a": "The last two digits of 6213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6213-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6213-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6213-2Z — two non-contact sheet-metal shields, 65×120×23 mm per ISO 15. Quoted values: C 58.5 kN, C0 40.5 kN, Pu 1.73 kN, limiting speed 6000 r/min, mass 1050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6213-ZZ." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6213-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6213-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6213-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6213-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6213-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6213-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7213", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6213-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6213 M (machined brass cage, open arrangement) is the same-size execution on the 65×120×23 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "213", "equiv_brand": "SKF", "level": "partial", "note": "SKF 213 shares the 65×120×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 213-2Z shares the 65×120×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6213-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6213-2Z", "material": "GCr15", "dynamic_load_kN": 58.5, "static_load_kN": 40.5, "fatigue_load_limit_kN": 1.73, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6214 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "The open 6214 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×125×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6214 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6214.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6214.", "The open 6214 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6214-2Z (shields) and 6214-2RSH (contact seals), not suffix-free 6214.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214 bearing?", "a": "A 6214 deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6214 have?", "a": "Unless a clearance suffix says otherwise, 6214 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6214 and verify the residual clearance after mounting." }, { "q": "How should 6214 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6214 need?", "a": "The open 6214 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6214?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214 — the open (unsealed) execution, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 7000 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6214." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6214-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6214-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6214 M (machined brass cage, open arrangement) is the same-size execution on the 70×125×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214 shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214-2Z shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6214", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6214-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6214-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6214-2RS for that.", "Do not wash 6214-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6214-2Z (one shield: 6214-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6214-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6214-2Z for high-contamination positions.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214-ZZ bearing?", "a": "A 6214-ZZ deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6214-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6214-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6214 and verify the residual clearance after mounting." }, { "q": "How should 6214-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6214-ZZ need?", "a": "6214-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6214-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214-2Z — two non-contact sheet-metal shields, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 5600 r/min, mass 1150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6214-ZZ." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6214-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6214-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6214 M (machined brass cage, open arrangement) is the same-size execution on the 70×125×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214 shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214-2Z shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6214-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6214-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6214-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6214-2RS runs slower and cooler-limited than the open 6214; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6214-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6214-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6214-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6214-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6214-RS1 exists for arrangements that lubricate through the open side; fitting 6214-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214-2RS bearing?", "a": "A 6214-2RS deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6214-2RS have?", "a": "Unless a clearance suffix says otherwise, 6214-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6214 and verify the residual clearance after mounting." }, { "q": "How should 6214-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6214-2RS need?", "a": "6214-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6214 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6214-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 3400 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6214-2RS." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6214-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6214-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6214 M (machined brass cage, open arrangement) is the same-size execution on the 70×125×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214 shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214-2Z shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6214-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6214-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6215 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 130 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "At 75 mm bore the 62xx light series is the workhorse section; its 130×25 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6215 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6215 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6215.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6215 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6215-2Z (shields) and 6215-2RSH (contact seals), not suffix-free 6215.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215 bearing?", "a": "A 6215 deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6215 mean?", "a": "A bare 6215 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6215?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215 — the open (unsealed) execution, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 6700 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6215." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6215-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6215-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6215 M (machined brass cage, open arrangement) is the same-size execution on the 75×130×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215 shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215-2Z shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6215", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6215-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 130 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6215-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6215 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "Do not wash 6215-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6215-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6215-2Z (one shield: 6215-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6215-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6215-2Z for high-contamination positions.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215-ZZ bearing?", "a": "A 6215-ZZ deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "Are 6215 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6215 uses the same ISO 15 envelope (75×130×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6215-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6215-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6215 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6215-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215-2Z — two non-contact sheet-metal shields, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 5300 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6215-ZZ." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6215-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6215-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6215 M (machined brass cage, open arrangement) is the same-size execution on the 75×130×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215 shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215-2Z shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6215-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6215-2Z", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6215-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6215 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6215-2RS runs slower and cooler-limited than the open 6215; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6215-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6215-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6215-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6215-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6215-RS1 exists for arrangements that lubricate through the open side; fitting 6215-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215-2RS bearing?", "a": "A 6215-2RS deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6215-2RS need?", "a": "6215-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6215 with a housing grease fitting instead." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6215-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6215-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 3200 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6215-2RS." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6215-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6215-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6215 M (machined brass cage, open arrangement) is the same-size execution on the 75×130×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215 shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215-2Z shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6215-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6215-2RS1", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6216 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×140×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6216 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6216-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 26 mm-wide ring of 6216 drags the lip and overheats it.", "The open 6216 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6216-2Z (shields) and 6216-2RSH (contact seals), not suffix-free 6216.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216 bearing?", "a": "A 6216 deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6216 mean?", "a": "A bare 6216 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6216?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216 — the open (unsealed) execution, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 6000 r/min, mass 1450 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6216." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6216-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6216-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6216 M (machined brass cage, open arrangement) is the same-size execution on the 80×140×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216 shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216-2Z shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6216", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6216-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 140 mm outside diameter and 26 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6216-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 80 mm of 6216-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6216-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6216-2RS for that.", "Shielded 6216-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6216-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6216-2Z (one shield: 6216-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6216-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6216-2Z for high-contamination positions.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216-ZZ bearing?", "a": "A 6216-ZZ deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6216-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6216-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216-2Z — two non-contact sheet-metal shields, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 4800 r/min, mass 1550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6216-ZZ." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6216-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6216-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6216 M (machined brass cage, open arrangement) is the same-size execution on the 80×140×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216 shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216-2Z shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6216-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6216-2Z", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6216-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 80 mm of 6216-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6216-2RS runs slower and cooler-limited than the open 6216; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6216-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6216-C3. No clearance suffix means normal CN clearance.", "Never mix components between two 6216-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the contact-sealed version as 6216-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6216-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6216-RS1 exists for arrangements that lubricate through the open side; fitting 6216-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216-2RS bearing?", "a": "A 6216-2RS deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6216-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "Are 6216 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6216 uses the same ISO 15 envelope (80×140×26 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6216-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 3000 r/min, mass 1500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6216-2RS." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6216-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6216-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6216 M (machined brass cage, open arrangement) is the same-size execution on the 80×140×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216 shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216-2Z shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6216-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6216-2RS1", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6217 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 150 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6217 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6217 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6217 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6217-2Z (shields) and 6217-2RSH (contact seals), not suffix-free 6217.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217 bearing?", "a": "A 6217 deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6217 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6217 uses the same ISO 15 envelope (85×150×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6217 have?", "a": "Unless a clearance suffix says otherwise, 6217 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6217 and verify the residual clearance after mounting." }, { "q": "How should 6217 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6217?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217 — the open (unsealed) execution, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 5600 r/min, mass 1800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6217." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6217-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6217-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6217 M (machined brass cage, open arrangement) is the same-size execution on the 85×150×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217 shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217-2Z shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6217", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6217-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 85 mm of 6217-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6217-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6217-2RS for that.", "Shielded 6217-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6217-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6217-2Z (one shield: 6217-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6217-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6217-2Z for high-contamination positions.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217-ZZ bearing?", "a": "A 6217-ZZ deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6217 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6217 uses the same ISO 15 envelope (85×150×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6217-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6217-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6217 and verify the residual clearance after mounting." }, { "q": "How should 6217-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6217-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217-2Z — two non-contact sheet-metal shields, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 4500 r/min, mass 1900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6217-ZZ." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6217-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6217-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6217 M (machined brass cage, open arrangement) is the same-size execution on the 85×150×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217 shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217-2Z shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6217-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6217-2Z", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 9000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6217-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6217-2RS runs slower and cooler-limited than the open 6217; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6217-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 6217-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6217-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9000 r/min thermal reference speed. The single-seal catalogue number is 6217-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6217-RS1 exists for arrangements that lubricate through the open side; fitting 6217-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217-2RS bearing?", "a": "A 6217-2RS deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6217-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6217-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 2800 r/min, mass 1900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6217-2RS." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6217-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6217-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6217 M (machined brass cage, open arrangement) is the same-size execution on the 85×150×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217 shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217-2Z shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6217-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6217-2RS1", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6218 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6218 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6218 units.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 30 mm-wide ring of 6218 drags the lip and overheats it.", "The open 6218 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6218-2Z (shields) and 6218-2RSH (contact seals), not suffix-free 6218.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218 bearing?", "a": "A 6218 deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6218 have?", "a": "Unless a clearance suffix says otherwise, 6218 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6218 and verify the residual clearance after mounting." }, { "q": "How should 6218 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6218 need?", "a": "The open 6218 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6218?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218 — the open (unsealed) execution, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 5300 r/min, mass 2200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6218." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6218-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6218-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6218 M (machined brass cage, open arrangement) is the same-size execution on the 90×160×30 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218 shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218-2Z shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6218", "material": "GCr15", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6218-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 160 mm outside diameter and 30 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6218-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6218 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6218-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6218-2RS for that.", "Do not wash 6218-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6218-ZZ.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6218-2Z (one shield: 6218-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6218-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6218-2Z for high-contamination positions.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218-ZZ bearing?", "a": "A 6218-ZZ deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6218-ZZ need?", "a": "6218-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6218 bore code work?", "a": "The last two digits of 6218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6218-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6218-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218-2Z — two non-contact sheet-metal shields, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 4300 r/min, mass 2300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6218-ZZ." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6218-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6218-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6218 M (machined brass cage, open arrangement) is the same-size execution on the 90×160×30 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218 shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218-2Z shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6218-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6218-2Z", "material": "GCr15", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6218-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6218 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Heat is the enemy of the sealed 6218-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6218-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6218-2RS and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 90 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6218-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6218-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6218-RS1 exists for arrangements that lubricate through the open side; fitting 6218-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218-2RS bearing?", "a": "A 6218-2RS deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "Are 6218 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6218 uses the same ISO 15 envelope (90×160×30 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6218-2RS have?", "a": "Unless a clearance suffix says otherwise, 6218-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6218 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6218-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 2600 r/min, mass 2300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6218-2RS." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6218-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6218-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6218 M (machined brass cage, open arrangement) is the same-size execution on the 90×160×30 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218 shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218-2Z shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6218-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6218-2RS1", "material": "GCr15", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6219 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 95 mm of 6219 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 95 mm bore; before upgrading to a 6319 for extra capacity, confirm the housing accepts a 170 mm OD and 32 mm width — it is not a drop-in swap.", "The open 6219 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×170×32 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6219 units.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 32 mm-wide ring of 6219 drags the lip and overheats it.", "The open 6219 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6219-2Z (shields) and 6219-2RSH (contact seals), not suffix-free 6219.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219 bearing?", "a": "A 6219 deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6219 mean?", "a": "A bare 6219 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6219?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219 — the open (unsealed) execution, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 5000 r/min, mass 2650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6219." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6219-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6219-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6219 M (machined brass cage, open arrangement) is the same-size execution on the 95×170×32 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219 shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219-2Z shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6219", "material": "GCr15", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6219-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6219-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 6219 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6219-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6219-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6219-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 170 mm OD should be round within IT7; an oval bore pinches the outer ring of 6219-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6219-2Z (one shield: 6219-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6219-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6219-2Z for high-contamination positions.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219-ZZ bearing?", "a": "A 6219-ZZ deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "Are 6219 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6219 uses the same ISO 15 envelope (95×170×32 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6219-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6219-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6219 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6219-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219-2Z — two non-contact sheet-metal shields, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 4000 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6219-ZZ." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6219-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6219-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6219 M (machined brass cage, open arrangement) is the same-size execution on the 95×170×32 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219 shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219-2Z shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6219-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6219-2Z", "material": "GCr15", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6219-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6219-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6219-2RS runs slower and cooler-limited than the open 6219; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6219-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6219-2RS.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6219-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6219-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6219-RS1 exists for arrangements that lubricate through the open side; fitting 6219-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219-2RS bearing?", "a": "A 6219-2RS deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6219-2RS need?", "a": "6219-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6219 with a housing grease fitting instead." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6219-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6219-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 2400 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6219-2RS." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6219-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6219-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6219 M (machined brass cage, open arrangement) is the same-size execution on the 95×170×32 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219 shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219-2Z shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6219-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6219-2RS1", "material": "GCr15", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6220 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 100 mm of 6220 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6220 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6220 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6220-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 180 mm OD should be round within IT7; an oval bore pinches the outer ring of 6220 and shows up later as two-point loaded raceway wear.", "The open 6220 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6220-2Z (shields) and 6220-2RSH (contact seals), not suffix-free 6220.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220 bearing?", "a": "A 6220 deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6220 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6220 uses the same ISO 15 envelope (100×180×34 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6220 have?", "a": "Unless a clearance suffix says otherwise, 6220 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6220 and verify the residual clearance after mounting." }, { "q": "How should 6220 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6220?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220 — the open (unsealed) execution, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 4800 r/min, mass 3200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6220." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6220-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6220-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6220 M (machined brass cage, open arrangement) is the same-size execution on the 100×180×34 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220 shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220-2Z shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6220", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6220-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6220-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6220-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6220-2RS for that.", "Shielded 6220-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 100 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6220-ZZ.", "SKF spells the shielded version 6220-2Z (one shield: 6220-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6220-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6220-2Z for high-contamination positions.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220-ZZ bearing?", "a": "A 6220-ZZ deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6220 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6220 uses the same ISO 15 envelope (100×180×34 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6220-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6220-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6220 and verify the residual clearance after mounting." }, { "q": "How should 6220-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6220-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220-2Z — two non-contact sheet-metal shields, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 3800 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6220-ZZ." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6220-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6220-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6220 M (machined brass cage, open arrangement) is the same-size execution on the 100×180×34 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220 shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220-2Z shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6220-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6220-2Z", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6220-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6220-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 100 mm of 6220-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6220-2RS runs slower and cooler-limited than the open 6220; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6220-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 180 mm OD should be round within IT7; an oval bore pinches the outer ring of 6220-2RS and shows up later as two-point loaded raceway wear.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6220-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6220-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6220-RS1 exists for arrangements that lubricate through the open side; fitting 6220-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220-2RS bearing?", "a": "A 6220-2RS deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6220-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "Are 6220 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6220 uses the same ISO 15 envelope (100×180×34 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6220-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 2400 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6220-2RS." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6220-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6220-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6220 M (machined brass cage, open arrangement) is the same-size execution on the 100×180×34 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220 shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220-2Z shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6220-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6220-2RS1", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6221", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 105 mm of 6221 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6221 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6221 units.", "The housing bore for the 190 mm OD should be round within IT7; an oval bore pinches the outer ring of 6221 and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 36 mm-wide ring of 6221 drags the lip and overheats it.", "The open 6221 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6221-2Z (shields) and 6221-2RSH (contact seals), not suffix-free 6221.", "The 140/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6221 bearing?", "a": "A 6221 deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6221 mean?", "a": "A bare 6221 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6221?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6221 — the open (unsealed) execution, 105×190×36 mm per ISO 15. Quoted values: C 140 kN, C0 104 kN, Pu 3.65 kN, limiting speed 4500 r/min, mass 3800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6221." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6221-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6221-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6221-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6221-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "7221", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6221", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 104, "fatigue_load_limit_kN": 3.65, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6221-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6221-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 190 mm outside diameter and 36 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6221-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 105 mm of 6221-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 105 mm bore the 62xx light series is the workhorse section; its 190×36 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6221-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6221-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6221-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 105 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6221-ZZ.", "SKF spells the shielded version 6221-2Z (one shield: 6221-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6221-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6221-2Z for high-contamination positions.", "The 140/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6221-ZZ bearing?", "a": "A 6221-ZZ deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6221-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6221-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6221 and verify the residual clearance after mounting." }, { "q": "How should 6221-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6221-ZZ need?", "a": "6221-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6221-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6221-2Z — two non-contact sheet-metal shields, 105×190×36 mm per ISO 15. Quoted values: C 140 kN, C0 104 kN, Pu 3.65 kN, limiting speed 3600 r/min, mass 3900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6221-ZZ." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6221-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6221-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6221-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6221-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7221", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6221-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6221-2Z", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 104, "fatigue_load_limit_kN": 3.65, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6222 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 200 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6222 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6222 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6222 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6222 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6222 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6222-2Z (shields) and 6222-2RSH (contact seals), not suffix-free 6222.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222 bearing?", "a": "A 6222 deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6222 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6222 have?", "a": "Unless a clearance suffix says otherwise, 6222 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6222 and verify the residual clearance after mounting." }, { "q": "How should 6222 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6222?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222 — the open (unsealed) execution, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 4300 r/min, mass 4450 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6222." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6222-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6222-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7222", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6222", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6222-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 200 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6222-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6222 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6222-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6222-2RS for that.", "Shielded 6222-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Never mix components between two 6222-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF spells the shielded version 6222-2Z (one shield: 6222-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6222-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6222-2Z for high-contamination positions.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222-ZZ bearing?", "a": "A 6222-ZZ deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "Are 6222 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6222-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6222-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6222 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6222-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222-2Z — two non-contact sheet-metal shields, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 3400 r/min, mass 4600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6222-ZZ." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6222-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6222-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7222", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6222-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6222-2Z", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6222-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 200 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6222-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 110 mm of 6222-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6222-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6222-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 110 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6222-2RS.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6222-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6700 r/min thermal reference speed. The single-seal catalogue number is 6222-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6222-RS1 exists for arrangements that lubricate through the open side; fitting 6222-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222-2RS bearing?", "a": "A 6222-2RS deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6222 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6222-2RS have?", "a": "Unless a clearance suffix says otherwise, 6222-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6222 and verify the residual clearance after mounting." }, { "q": "How should 6222-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6222-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 2000 r/min, mass 4600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6222-2RS." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6222-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6222-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7222", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6222-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6222-2RS1", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "limiting_speed_rpm": 2000, "max_rpm": 2000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 53, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6300 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Miniature bearings like 6300 (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium section at 10 mm bore gains dynamic rating through larger rolling elements on a 35 mm OD; the penalty is mass and a lower limiting speed than the 6200 — do not specify it for speed-critical shafts.", "The open 6300 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6300 units.", "The housing bore for the 35 mm OD should be round within IT7; an oval bore pinches the outer ring of 6300 and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6300 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6300-2Z (shields) and 6300-2RSH (contact seals), not suffix-free 6300.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300 bearing?", "a": "A 6300 deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6300 mean?", "a": "A bare 6300 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6300 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6300 uses the same ISO 15 envelope (10×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6300?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300 — the open (unsealed) execution, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 32000 r/min, mass 53 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6300." } ], "cross_ref": [ { "equiv_sku": "6300-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2RS1 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2Z shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6300", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 55, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6300-2Z.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Codes 00–03 are the exception series: 6300 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 63xx medium section at 10 mm bore gains dynamic rating through larger rolling elements on a 35 mm OD; the penalty is mass and a lower limiting speed than the 6200 — do not specify it for speed-critical shafts.", "Do not wash 6300-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6300-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 35 mm OD should be round within IT7; an oval bore pinches the outer ring of 6300-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6300-2Z (one shield: 6300-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6300-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6300-2Z for high-contamination positions.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-ZZ bearing?", "a": "A 6300-ZZ deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6300-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6300 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6300 uses the same ISO 15 envelope (10×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6300-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2Z — two non-contact sheet-metal shields, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 26000 r/min, mass 55 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6300-ZZ." } ], "cross_ref": [ { "equiv_sku": "6300-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2RS1 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2Z shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6300-2Z", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 54, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6300-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6200.", "Heat is the enemy of the sealed 6300-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6300-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 11 mm-wide ring of 6300-2RS drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6300-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 15000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6300-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6300-RSH exists for arrangements that lubricate through the open side; fitting 6300-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-2RS bearing?", "a": "A 6300-2RS deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6300-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6300-2RS need?", "a": "6300-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6300 with a housing grease fitting instead." }, { "q": "Why does 6300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6300-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2RSH — two contact elastomer seals over a lifetime grease fill, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 15000 r/min, mass 54 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6300-2RS." } ], "cross_ref": [ { "equiv_sku": "6300-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2RS1 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2Z shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6300-2RSH", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 60, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6301 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 37 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium section at 12 mm bore gains dynamic rating through larger rolling elements on a 37 mm OD; the penalty is mass and a lower limiting speed than the 6201 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6301 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6301 units.", "Never mix components between two 6301 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6301 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6301-2Z (shields) and 6301-2RSH (contact seals), not suffix-free 6301.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301 bearing?", "a": "A 6301 deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6301 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6301 need?", "a": "The open 6301 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6301?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301 — the open (unsealed) execution, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 28000 r/min, mass 60 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6301." } ], "cross_ref": [ { "equiv_sku": "6301-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6301-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7301", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2RS1 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2Z shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6301", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 63, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6301-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 37 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6301-2Z.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium section at 12 mm bore gains dynamic rating through larger rolling elements on a 37 mm OD; the penalty is mass and a lower limiting speed than the 6201 — do not specify it for speed-critical shafts.", "Do not wash 6301-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6301-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6301-2Z (one shield: 6301-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6301-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6301-2Z for high-contamination positions.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-ZZ bearing?", "a": "A 6301-ZZ deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6301-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 12 mm bore?", "a": "The '3' is the medium diameter series: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 6201 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6301-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2Z — two non-contact sheet-metal shields, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 22000 r/min, mass 63 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6301-ZZ." } ], "cross_ref": [ { "equiv_sku": "6301-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7301", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2RS1 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2Z shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6301-2Z", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 62, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6301-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "Contact seals add drag and heat: 6301-2RS runs slower and cooler-limited than the open 6301; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6301-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 6301-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6301-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed. The single-seal catalogue number is 6301-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6301-RSH exists for arrangements that lubricate through the open side; fitting 6301-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-2RS bearing?", "a": "A 6301-2RS deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6301-2RS need?", "a": "6301-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6301 with a housing grease fitting instead." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6301-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6301-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2RSH — two contact elastomer seals over a lifetime grease fill, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 14000 r/min, mass 62 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6301-2RS." } ], "cross_ref": [ { "equiv_sku": "6301-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6301-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7301", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2RS1 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2Z shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6301-2RSH", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 82, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6302 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 42 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "The open 6302 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×42×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6302 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6302.", "The open 6302 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6302-2Z (shields) and 6302-2RSH (contact seals), not suffix-free 6302.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302 bearing?", "a": "A 6302 deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6302 mean?", "a": "A bare 6302 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6302 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6302 uses the same ISO 15 envelope (15×42×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6302?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302 — the open (unsealed) execution, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 24000 r/min, mass 82 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6302." } ], "cross_ref": [ { "equiv_sku": "6302-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6302-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7302", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2RS1 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2Z shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6302", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 86, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6302-2Z.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Miniature bearings like 6302-ZZ (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium section at 15 mm bore gains dynamic rating through larger rolling elements on a 42 mm OD; the penalty is mass and a lower limiting speed than the 6202 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6302-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6302-2RS for that.", "Do not wash 6302-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 6302-ZZ and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 6302-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6302-2Z (one shield: 6302-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6302-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6302-2Z for high-contamination positions.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-ZZ bearing?", "a": "A 6302-ZZ deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6302-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6302 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6302 uses the same ISO 15 envelope (15×42×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6302-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2Z — two non-contact sheet-metal shields, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 19000 r/min, mass 86 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6302-ZZ." } ], "cross_ref": [ { "equiv_sku": "6302-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7302", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2RS1 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2Z shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6302-2Z", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 85, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6302-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 42 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6302-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Miniature bearings like 6302-2RS (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium section at 15 mm bore gains dynamic rating through larger rolling elements on a 42 mm OD; the penalty is mass and a lower limiting speed than the 6202 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6302-2RS runs slower and cooler-limited than the open 6302; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6302-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6302-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6302-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6302-RSH exists for arrangements that lubricate through the open side; fitting 6302-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-2RS bearing?", "a": "A 6302-2RS deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6302-2RS have?", "a": "Unless a clearance suffix says otherwise, 6302-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6302 and verify the residual clearance after mounting." }, { "q": "How should 6302-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6302-2RS need?", "a": "6302-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6302 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6302-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2RSH — two contact elastomer seals over a lifetime grease fill, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 12000 r/min, mass 85 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6302-2RS." } ], "cross_ref": [ { "equiv_sku": "6302-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6302-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7302", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2RS1 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2Z shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6302-2RSH", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6303 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6203.", "The open 6303 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6303 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 47 mm OD should be round within IT7; an oval bore pinches the outer ring of 6303 and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6303 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6303-2Z (shields) and 6303-2RSH (contact seals), not suffix-free 6303.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303 bearing?", "a": "A 6303 deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6303 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6303 need?", "a": "The open 6303 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6303?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303 — the open (unsealed) execution, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 22000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6303." } ], "cross_ref": [ { "equiv_sku": "6303-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "7303", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6303-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2RS1 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2Z shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6303", "material": "GCr15", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6303-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6303-2Z.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Miniature bearings like 6303-ZZ (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium section at 17 mm bore gains dynamic rating through larger rolling elements on a 47 mm OD; the penalty is mass and a lower limiting speed than the 6203 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6303-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6303-2RS for that.", "Shielded 6303-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6303-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6303-ZZ.", "SKF spells the shielded version 6303-2Z (one shield: 6303-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6303-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6303-2Z for high-contamination positions.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303-ZZ bearing?", "a": "A 6303-ZZ deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6303-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6303-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6303 and verify the residual clearance after mounting." }, { "q": "How should 6303-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6303-ZZ need?", "a": "6303-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6303-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303-2Z — two non-contact sheet-metal shields, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 17000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6303-ZZ." } ], "cross_ref": [ { "equiv_sku": "6303-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7303", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6303-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2RS1 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2Z shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6303-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6303-2Z", "material": "GCr15", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6304 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6304.", "The 63xx medium section at 20 mm bore gains dynamic rating through larger rolling elements on a 52 mm OD; the penalty is mass and a lower limiting speed than the 6204 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6304 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6304 units.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6304.", "The open 6304 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6304-2Z (shields) and 6304-2RSH (contact seals), not suffix-free 6304.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304 bearing?", "a": "A 6304 deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6304 bore code work?", "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6304 mean?", "a": "A bare 6304 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6304?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304 — the open (unsealed) execution, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 19000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6304." } ], "cross_ref": [ { "equiv_sku": "6304-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2RS1 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2Z shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6304", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6304-2Z.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 20 mm shaft for 6304 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium section at 20 mm bore gains dynamic rating through larger rolling elements on a 52 mm OD; the penalty is mass and a lower limiting speed than the 6204 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6304-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6304-2RS for that.", "Do not wash 6304-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6304-ZZ.", "SKF spells the shielded version 6304-2Z (one shield: 6304-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6304-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6304-2Z for high-contamination positions.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-ZZ bearing?", "a": "A 6304-ZZ deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6304 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6304 uses the same ISO 15 envelope (20×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6304-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6304-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6304 and verify the residual clearance after mounting." }, { "q": "How should 6304-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6304-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2Z — two non-contact sheet-metal shields, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6304-ZZ." } ], "cross_ref": [ { "equiv_sku": "6304-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2RS1 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2Z shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6304-2Z", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6304-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6304-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium section at 20 mm bore gains dynamic rating through larger rolling elements on a 52 mm OD; the penalty is mass and a lower limiting speed than the 6204 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6304-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6304-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 20 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6304-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed. The single-seal catalogue number is 6304-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6304-RSH exists for arrangements that lubricate through the open side; fitting 6304-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-2RS bearing?", "a": "A 6304-2RS deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6304-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6304 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6304 uses the same ISO 15 envelope (20×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6304-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2RSH — two contact elastomer seals over a lifetime grease fill, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 9500 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6304-2RS." } ], "cross_ref": [ { "equiv_sku": "6304-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2RS1 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2Z shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6304-2RSH", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6305 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6305.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "Storage matters for open bearings: 6305 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6305 units.", "Never mix components between two 6305 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6305 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6305-2Z (shields) and 6305-2RSH (contact seals), not suffix-free 6305.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305 bearing?", "a": "A 6305 deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6305 need?", "a": "The open 6305 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6305 mean?", "a": "A bare 6305 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6305?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305 — the open (unsealed) execution, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 16000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6305." } ], "cross_ref": [ { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726305-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726305-2RS1 is a standard-inner-ring insert on the same 25x62x17 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2RS1 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2Z shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305 shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305-2Z shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6305", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6305-2Z.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium section at 25 mm bore gains dynamic rating through larger rolling elements on a 62 mm OD; the penalty is mass and a lower limiting speed than the 6205 — do not specify it for speed-critical shafts.", "Do not wash 6305-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6305-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6305-ZZ.", "SKF spells the shielded version 6305-2Z (one shield: 6305-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6305-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6305-2Z for high-contamination positions.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-ZZ bearing?", "a": "A 6305-ZZ deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6305 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6305 uses the same ISO 15 envelope (25×62×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6305-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6305-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6305 and verify the residual clearance after mounting." }, { "q": "How should 6305-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6305-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2Z — two non-contact sheet-metal shields, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 13000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6305-ZZ." } ], "cross_ref": [ { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2RS1 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2Z shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305 shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305-2Z shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6305-2Z", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 240, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6305-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6305-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6305-2RS.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "Contact seals add drag and heat: 6305-2RS runs slower and cooler-limited than the open 6305; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6305-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6305-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6305-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6305-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6305-RSH exists for arrangements that lubricate through the open side; fitting 6305-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-2RS bearing?", "a": "A 6305-2RS deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 25 mm bore?", "a": "The '3' is the medium diameter series: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 6205 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6305 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6305 uses the same ISO 15 envelope (25×62×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6305-2RS have?", "a": "Unless a clearance suffix says otherwise, 6305-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6305 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6305-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2RSH — two contact elastomer seals over a lifetime grease fill, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 7500 r/min, mass 240 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6305-2RS." } ], "cross_ref": [ { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2RS1 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2Z shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305 shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305-2Z shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6305-2RSH", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6306 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 72 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "A 30 mm shaft for 6306 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.", "The open 6306 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×72×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6306 units.", "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6306.", "The open 6306 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6306-2Z (shields) and 6306-2RSH (contact seals), not suffix-free 6306.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306 bearing?", "a": "A 6306 deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6306 need?", "a": "The open 6306 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6306 mean?", "a": "A bare 6306 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6306?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306 — the open (unsealed) execution, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 13000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6306." } ], "cross_ref": [ { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726306-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726306-2RS1 is a standard-inner-ring insert on the same 30x72x19 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2RS1 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2Z shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306 shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306-2Z shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6306", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6306-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6306-ZZ.", "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6306-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6306-2RS for that.", "Shielded 6306-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6306-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6306-2Z (one shield: 6306-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6306-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6306-2Z for high-contamination positions.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-ZZ bearing?", "a": "A 6306-ZZ deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6306-ZZ need?", "a": "6306-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6306-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6306-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2Z — two non-contact sheet-metal shields, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 11000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6306-ZZ." } ], "cross_ref": [ { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2RS1 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2Z shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306 shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306-2Z shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6306-2Z", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6306-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 72 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6306-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6306-2RS runs slower and cooler-limited than the open 6306; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6306-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 19 mm-wide ring of 6306-2RS drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6306-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6306-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6306-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6306-RSH exists for arrangements that lubricate through the open side; fitting 6306-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-2RS bearing?", "a": "A 6306-2RS deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6306 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6306 uses the same ISO 15 envelope (30×72×19 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6306-2RS have?", "a": "Unless a clearance suffix says otherwise, 6306-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6306 and verify the residual clearance after mounting." }, { "q": "How should 6306-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6306-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2RSH — two contact elastomer seals over a lifetime grease fill, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 6300 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6306-2RS." } ], "cross_ref": [ { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2RS1 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2Z shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306 shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306-2Z shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6306-2RSH", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6307.", "The 63xx medium section at 35 mm bore gains dynamic rating through larger rolling elements on a 80 mm OD; the penalty is mass and a lower limiting speed than the 6207 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6307 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6307 units.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 6307 and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6307 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6307-2Z (shields) and 6307-2RSH (contact seals), not suffix-free 6307.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307 bearing?", "a": "A 6307 deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6307 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6307 uses the same ISO 15 envelope (35×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6307 have?", "a": "Unless a clearance suffix says otherwise, 6307 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6307 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6307?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307 — the open (unsealed) execution, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 12000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6307." } ], "cross_ref": [ { "equiv_sku": "6307-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726307-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726307-2RS1 is a standard-inner-ring insert on the same 35x80x21 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6307-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6307 M (machined brass cage, open arrangement) is the same-size execution on the 35×80×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6307-2RS1 shares the 35×80×21 mm envelope but rates differently (35.1/19 kN vs 28.6/19 kN) — not a load-rating equivalent." }, { "equiv_sku": "307", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307 shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "307-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307-2Z shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6307", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 480, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6307-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 80 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6307-2Z.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.", "ZZ shields are non-contact: 6307-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6307-2RS for that.", "Shielded 6307-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6307-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6307-ZZ.", "SKF spells the shielded version 6307-2Z (one shield: 6307-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6307-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6307-2Z for high-contamination positions.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307-ZZ bearing?", "a": "A 6307-ZZ deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6307 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6307 uses the same ISO 15 envelope (35×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6307-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6307-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6307 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6307-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307-2Z — two non-contact sheet-metal shields, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 9500 r/min, mass 480 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6307-ZZ." } ], "cross_ref": [ { "equiv_sku": "6307-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6307-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6307 M (machined brass cage, open arrangement) is the same-size execution on the 35×80×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6307-2RS1 shares the 35×80×21 mm envelope but rates differently (35.1/19 kN vs 28.6/19 kN) — not a load-rating equivalent." }, { "equiv_sku": "307", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307 shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "307-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307-2Z shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6307-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6307-2Z", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6307-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium section at 35 mm bore gains dynamic rating through larger rolling elements on a 80 mm OD; the penalty is mass and a lower limiting speed than the 6207 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6307-2RS runs slower and cooler-limited than the open 6307; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6307-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6307-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed. The single-seal catalogue number is 6307-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6307-RSH exists for arrangements that lubricate through the open side; fitting 6307-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307-2RS bearing?", "a": "A 6307-2RS deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6307 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6307 uses the same ISO 15 envelope (35×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6307-2RS have?", "a": "Unless a clearance suffix says otherwise, 6307-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6307 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6307-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307-2RSH — two contact elastomer seals over a lifetime grease fill, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 6000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6307-2RS." } ], "cross_ref": [ { "equiv_sku": "6307-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6307-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6307 M (machined brass cage, open arrangement) is the same-size execution on the 35×80×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6307-2RS1 shares the 35×80×21 mm envelope but rates differently (35.1/19 kN vs 28.6/19 kN) — not a load-rating equivalent." }, { "equiv_sku": "307", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307 shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "307-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307-2Z shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6307-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6307-2RSH", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 630, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6308 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 90 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "The open 6308 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6308 units.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6308 and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6308 drags the lip and overheats it.", "The open 6308 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6308-2Z (shields) and 6308-2RSH (contact seals), not suffix-free 6308.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308 bearing?", "a": "A 6308 deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6308 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6308 need?", "a": "The open 6308 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6308?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308 — the open (unsealed) execution, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 11000 r/min, mass 630 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6308." } ], "cross_ref": [ { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726308-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726308-2RS1 is a standard-inner-ring insert on the same 40x90x23 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308 shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308-2Z shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6308", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6308-2Z.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "A 40 mm shaft for 6308 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium section at 40 mm bore gains dynamic rating through larger rolling elements on a 90 mm OD; the penalty is mass and a lower limiting speed than the 6208 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6308-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6308-2RS for that.", "Shielded 6308-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 40 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6308-ZZ.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6308-2Z (one shield: 6308-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6308-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6308-2Z for high-contamination positions.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-ZZ bearing?", "a": "A 6308-ZZ deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6308-ZZ need?", "a": "6308-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6308-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6308-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2Z — two non-contact sheet-metal shields, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 8500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6308-ZZ." } ], "cross_ref": [ { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308 shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308-2Z shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6308-2Z", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6308-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium section at 40 mm bore gains dynamic rating through larger rolling elements on a 90 mm OD; the penalty is mass and a lower limiting speed than the 6208 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6308-2RS runs slower and cooler-limited than the open 6308; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6308-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6308-2RS and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6308-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 6308-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed. The single-seal catalogue number is 6308-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6308-RSH exists for arrangements that lubricate through the open side; fitting 6308-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-2RS bearing?", "a": "A 6308-2RS deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6308-2RS need?", "a": "6308-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6308 with a housing grease fitting instead." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6308-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6308-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2RSH — two contact elastomer seals over a lifetime grease fill, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 5000 r/min, mass 640 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6308-2RS." } ], "cross_ref": [ { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308 shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308-2Z shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6308-2RSH", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 840, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6309.", "The 63xx medium section at 45 mm bore gains dynamic rating through larger rolling elements on a 100 mm OD; the penalty is mass and a lower limiting speed than the 6209 — do not specify it for speed-critical shafts.", "The open 6309 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×100×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6309 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6309.", "The open 6309 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6309-2Z (shields) and 6309-2RSH (contact seals), not suffix-free 6309.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309 bearing?", "a": "A 6309 deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6309 mean?", "a": "A bare 6309 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6309 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6309 uses the same ISO 15 envelope (45×100×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6309?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309 — the open (unsealed) execution, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 9500 r/min, mass 840 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6309." } ], "cross_ref": [ { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6309-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6309-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726309-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726309-2RS1 is a standard-inner-ring insert on the same 45x100x25 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "1726309-B-2RS1-VP274", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726309B-2RS1/VP274 is a standard-inner-ring insert on the same 45x100x25 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6309 M (machined brass cage, open arrangement) is the same-size execution on the 45×100×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "309", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309 shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309-2Z shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6309", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 870, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6309-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6309-ZZ.", "The 63xx medium section at 45 mm bore gains dynamic rating through larger rolling elements on a 100 mm OD; the penalty is mass and a lower limiting speed than the 6209 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6309-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6309-2RS for that.", "Do not wash 6309-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Never mix components between two 6309-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF spells the shielded version 6309-2Z (one shield: 6309-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6309-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6309-2Z for high-contamination positions.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309-ZZ bearing?", "a": "A 6309-ZZ deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6309-ZZ need?", "a": "6309-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6309-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6309-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309-2Z — two non-contact sheet-metal shields, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 7500 r/min, mass 870 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6309-ZZ." } ], "cross_ref": [ { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6309-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6309-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6309 M (machined brass cage, open arrangement) is the same-size execution on the 45×100×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "309", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309 shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309-2Z shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6309-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6309-2Z", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6309-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 100 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6309-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6309-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "Contact seals add drag and heat: 6309-2RS runs slower and cooler-limited than the open 6309; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6309-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6309-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6309-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6309-RSH exists for arrangements that lubricate through the open side; fitting 6309-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309-2RS bearing?", "a": "A 6309-2RS deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6309-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6309 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6309 uses the same ISO 15 envelope (45×100×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6309-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309-2RSH — two contact elastomer seals over a lifetime grease fill, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 4500 r/min, mass 850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6309-2RS." } ], "cross_ref": [ { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6309-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6309-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6309 M (machined brass cage, open arrangement) is the same-size execution on the 45×100×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "309", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309 shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309-2Z shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6309-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6309-2RSH", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.", "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "The open 6310 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×110×27 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6310 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6310.", "The open 6310 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6310-2Z (shields) and 6310-2RSH (contact seals), not suffix-free 6310.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310 bearing?", "a": "A 6310 deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6310 have?", "a": "Unless a clearance suffix says otherwise, 6310 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6310 and verify the residual clearance after mounting." }, { "q": "How should 6310 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6310 need?", "a": "The open 6310 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6310?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310 — the open (unsealed) execution, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 8500 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6310." } ], "cross_ref": [ { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6310-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6310-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726310-B-2RS1-VP274", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726310B-2RS1/VP274 is a standard-inner-ring insert on the same 50x110x27 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "1726310-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726310-2RS1 is a standard-inner-ring insert on the same 50x110x27 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6310 M (machined brass cage, open arrangement) is the same-size execution on the 50×110×27 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "310", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310 shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310-2Z shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6310", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6310-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6310 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium section at 50 mm bore gains dynamic rating through larger rolling elements on a 110 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6310-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6310-2RS for that.", "Do not wash 6310-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6310-ZZ.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6310-2Z (one shield: 6310-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6310-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6310-2Z for high-contamination positions.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310-ZZ bearing?", "a": "A 6310-ZZ deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6310-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6310-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6310 and verify the residual clearance after mounting." }, { "q": "How should 6310-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6310-ZZ need?", "a": "6310-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6310-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310-2Z — two non-contact sheet-metal shields, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 6700 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6310-ZZ." } ], "cross_ref": [ { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6310-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6310-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6310 M (machined brass cage, open arrangement) is the same-size execution on the 50×110×27 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "310", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310 shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310-2Z shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6310-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6310-2Z", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6310-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 110 mm outside diameter and 27 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6310-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6310 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 50 mm bore gains dynamic rating through larger rolling elements on a 110 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6310-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6310-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6310-2RS.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6310-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6310-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6310-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6310-RSH exists for arrangements that lubricate through the open side; fitting 6310-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310-2RS bearing?", "a": "A 6310-2RS deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6310-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6310-2RS need?", "a": "6310-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6310 with a housing grease fitting instead." }, { "q": "How does the 6310 bore code work?", "a": "The last two digits of 6310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6310-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310-2RSH — two contact elastomer seals over a lifetime grease fill, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 4300 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6310-2RS." } ], "cross_ref": [ { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6310-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6310-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6310 M (machined brass cage, open arrangement) is the same-size execution on the 50×110×27 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "310", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310 shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310-2Z shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6310-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6310-2RSH", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6311 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "Storage matters for open bearings: 6311 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6311 units.", "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6311 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6311-2Z (shields) and 6311-2RSH (contact seals), not suffix-free 6311.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311 bearing?", "a": "A 6311 deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6311 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6311 need?", "a": "The open 6311 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6311 bore code work?", "a": "The last two digits of 6311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6311?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311 — the open (unsealed) execution, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 8000 r/min, mass 1350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6311." } ], "cross_ref": [ { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6311-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6311-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6311 M (machined brass cage, open arrangement) is the same-size execution on the 55×120×29 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "311", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311 shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311-2Z shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6311", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 12000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6311-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 120 mm outside diameter and 29 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6311-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6311 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.", "Do not wash 6311-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6311-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6311-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6311-2Z (one shield: 6311-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6311-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6311-2Z for high-contamination positions.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311-ZZ bearing?", "a": "A 6311-ZZ deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6311 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6311 uses the same ISO 15 envelope (55×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6311-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6311-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6311 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6311-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311-2Z — two non-contact sheet-metal shields, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 6300 r/min, mass 1400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6311-ZZ." } ], "cross_ref": [ { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6311-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6311-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6311 M (machined brass cage, open arrangement) is the same-size execution on the 55×120×29 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "311", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311 shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311-2Z shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6311-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6311-2Z", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6311-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6311 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6311-2RS runs slower and cooler-limited than the open 6311; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6311-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6311-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 3800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed. The single-seal catalogue number is 6311-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6311-RSH exists for arrangements that lubricate through the open side; fitting 6311-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311-2RS bearing?", "a": "A 6311-2RS deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6311 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6311 uses the same ISO 15 envelope (55×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6311-2RS have?", "a": "Unless a clearance suffix says otherwise, 6311-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6311 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6311-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311-2RSH — two contact elastomer seals over a lifetime grease fill, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 3800 r/min, mass 1400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6311-2RS." } ], "cross_ref": [ { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6311-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6311-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6311 M (machined brass cage, open arrangement) is the same-size execution on the 55×120×29 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "311", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311 shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311-2Z shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6311-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6311-2RSH", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6312 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 130 mm outside diameter and 31 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium section at 60 mm bore gains dynamic rating through larger rolling elements on a 130 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6312 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6312 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Never mix components between two 6312 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6312 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6312-2Z (shields) and 6312-2RSH (contact seals), not suffix-free 6312.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312 bearing?", "a": "A 6312 deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6312 need?", "a": "The open 6312 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6312 mean?", "a": "A bare 6312 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6312?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312 — the open (unsealed) execution, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 7000 r/min, mass 1700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6312." } ], "cross_ref": [ { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6312-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6312-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6312 M (machined brass cage, open arrangement) is the same-size execution on the 60×130×31 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "312", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312 shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312-2Z shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6312", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6312-2Z.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium section at 60 mm bore gains dynamic rating through larger rolling elements on a 130 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.", "Do not wash 6312-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6312-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 60 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6312-ZZ.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6312-2Z (one shield: 6312-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6312-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6312-2Z for high-contamination positions.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312-ZZ bearing?", "a": "A 6312-ZZ deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6312-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6312-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6312 and verify the residual clearance after mounting." }, { "q": "How should 6312-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6312-ZZ need?", "a": "6312-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6312-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312-2Z — two non-contact sheet-metal shields, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 5600 r/min, mass 1800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6312-ZZ." } ], "cross_ref": [ { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6312-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6312-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6312 M (machined brass cage, open arrangement) is the same-size execution on the 60×130×31 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "312", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312 shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312-2Z shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6312-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6312-2Z", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6312-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium section at 60 mm bore gains dynamic rating through larger rolling elements on a 130 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6312-2RS runs slower and cooler-limited than the open 6312; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6312-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6312-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6312-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6312-RSH exists for arrangements that lubricate through the open side; fitting 6312-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312-2RS bearing?", "a": "A 6312-2RS deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6312-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 60 mm bore?", "a": "The '3' is the medium diameter series: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 6212 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6312-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312-2RSH — two contact elastomer seals over a lifetime grease fill, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 3400 r/min, mass 1750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6312-2RS." } ], "cross_ref": [ { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6312-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6312-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6312 M (machined brass cage, open arrangement) is the same-size execution on the 60×130×31 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "312", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312 shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312-2Z shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6312-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6312-2RSH", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6313 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium section at 65 mm bore gains dynamic rating through larger rolling elements on a 140 mm OD; the penalty is mass and a lower limiting speed than the 6213 — do not specify it for speed-critical shafts.", "The open 6313 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6313 units.", "The housing bore for the 140 mm OD should be round within IT7; an oval bore pinches the outer ring of 6313 and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6313 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6313-2Z (shields) and 6313-2RSH (contact seals), not suffix-free 6313.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313 bearing?", "a": "A 6313 deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6313 bore code work?", "a": "The last two digits of 6313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6313 mean?", "a": "A bare 6313 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6313?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313 — the open (unsealed) execution, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 6700 r/min, mass 2100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6313." } ], "cross_ref": [ { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6313-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6313-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6313 M (machined brass cage, open arrangement) is the same-size execution on the 65×140×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "313", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313 shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313-2Z shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6313", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6313-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6313-2Z.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium section at 65 mm bore gains dynamic rating through larger rolling elements on a 140 mm OD; the penalty is mass and a lower limiting speed than the 6213 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6313-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6313-2RS for that.", "Do not wash 6313-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6313-ZZ.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6313-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6313-2Z (one shield: 6313-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6313-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6313-2Z for high-contamination positions.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313-ZZ bearing?", "a": "A 6313-ZZ deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6313-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6313 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6313 uses the same ISO 15 envelope (65×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6313-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313-2Z — two non-contact sheet-metal shields, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 5300 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6313-ZZ." } ], "cross_ref": [ { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6313-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6313-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6313 M (machined brass cage, open arrangement) is the same-size execution on the 65×140×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "313", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313 shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313-2Z shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6313-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6313-2Z", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6313-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6313-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6313 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "Heat is the enemy of the sealed 6313-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6313-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6313-2RS.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6313-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6313-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6313-RS1 exists for arrangements that lubricate through the open side; fitting 6313-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313-2RS bearing?", "a": "A 6313-2RS deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6313 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6313 uses the same ISO 15 envelope (65×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6313-2RS have?", "a": "Unless a clearance suffix says otherwise, 6313-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6313 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6313-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 3200 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6313-2RS." } ], "cross_ref": [ { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6313-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6313-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6313 M (machined brass cage, open arrangement) is the same-size execution on the 65×140×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "313", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313 shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313-2Z shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6313-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6313-2RS1", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6314 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 70 mm bore gains dynamic rating through larger rolling elements on a 150 mm OD; the penalty is mass and a lower limiting speed than the 6214 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6314 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6314 units.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6314 and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6314 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6314-2Z (shields) and 6314-2RSH (contact seals), not suffix-free 6314.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314 bearing?", "a": "A 6314 deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6314 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6314 need?", "a": "The open 6314 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6314?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314 — the open (unsealed) execution, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 6300 r/min, mass 2550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6314." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6314-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6314-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6314 M (machined brass cage, open arrangement) is the same-size execution on the 70×150×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314 shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314-2Z shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6314", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6314-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 150 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6314-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6314 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 70 mm bore gains dynamic rating through larger rolling elements on a 150 mm OD; the penalty is mass and a lower limiting speed than the 6214 — do not specify it for speed-critical shafts.", "Do not wash 6314-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6314-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 70 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 35 mm-wide ring of 6314-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6314-2Z (one shield: 6314-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6314-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6314-2Z for high-contamination positions.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314-ZZ bearing?", "a": "A 6314-ZZ deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6314-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6314-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6314 and verify the residual clearance after mounting." }, { "q": "How should 6314-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6314-ZZ need?", "a": "6314-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6314-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314-2Z — two non-contact sheet-metal shields, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 5000 r/min, mass 2650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6314-ZZ." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6314-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6314-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6314 M (machined brass cage, open arrangement) is the same-size execution on the 70×150×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314 shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314-2Z shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6314-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6314-2Z", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6314-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 150 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6314-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium section at 70 mm bore gains dynamic rating through larger rolling elements on a 150 mm OD; the penalty is mass and a lower limiting speed than the 6214 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6314-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6314-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6314-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 6314-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6314-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6314-RS1 exists for arrangements that lubricate through the open side; fitting 6314-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314-2RS bearing?", "a": "A 6314-2RS deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6314 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6314 uses the same ISO 15 envelope (70×150×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6314-2RS have?", "a": "Unless a clearance suffix says otherwise, 6314-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6314 and verify the residual clearance after mounting." }, { "q": "How should 6314-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6314-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 3000 r/min, mass 2600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6314-2RS." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6314-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6314-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6314 M (machined brass cage, open arrangement) is the same-size execution on the 70×150×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314 shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314-2Z shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6314-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6314-2RS1", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6315 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 160 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "The open 6315 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6315 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6315.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6315 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6315-2Z (shields) and 6315-2RSH (contact seals), not suffix-free 6315.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315 bearing?", "a": "A 6315 deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6315 have?", "a": "Unless a clearance suffix says otherwise, 6315 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6315 and verify the residual clearance after mounting." }, { "q": "How should 6315 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6315 need?", "a": "The open 6315 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6315?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315 — the open (unsealed) execution, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 5600 r/min, mass 3050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6315." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6315-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6315-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6315 M (machined brass cage, open arrangement) is the same-size execution on the 75×160×37 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315 shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315-2Z shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6315", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6315-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6315 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "ZZ shields are non-contact: 6315-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6315-2RS for that.", "Shielded 6315-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6315-2Z (one shield: 6315-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6315-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6315-2Z for high-contamination positions.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315-ZZ bearing?", "a": "A 6315-ZZ deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6315-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6315-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6315 and verify the residual clearance after mounting." }, { "q": "How should 6315-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6315-ZZ need?", "a": "6315-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6315-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315-2Z — two non-contact sheet-metal shields, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 4500 r/min, mass 3150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6315-ZZ." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6315-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6315-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6315 M (machined brass cage, open arrangement) is the same-size execution on the 75×160×37 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315 shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315-2Z shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6315-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6315-2Z", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 9000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6315-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "Contact seals add drag and heat: 6315-2RS runs slower and cooler-limited than the open 6315; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6315-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 37 mm-wide ring of 6315-2RS drags the lip and overheats it.", "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6315-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 6315-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9000 r/min thermal reference speed. The single-seal catalogue number is 6315-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6315-RS1 exists for arrangements that lubricate through the open side; fitting 6315-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315-2RS bearing?", "a": "A 6315-2RS deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6315-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6315 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6315 uses the same ISO 15 envelope (75×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6315-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 2800 r/min, mass 3150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6315-2RS." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6315-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6315-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6315 M (machined brass cage, open arrangement) is the same-size execution on the 75×160×37 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315 shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315-2Z shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6315-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6315-2RS1", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6316 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 170 mm outside diameter and 39 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "The open 6316 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×170×39 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6316 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6316 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6316-2Z (shields) and 6316-2RSH (contact seals), not suffix-free 6316.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316 bearing?", "a": "A 6316 deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6316 have?", "a": "Unless a clearance suffix says otherwise, 6316 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6316 and verify the residual clearance after mounting." }, { "q": "How should 6316 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6316 need?", "a": "The open 6316 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6316?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316 — the open (unsealed) execution, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 5300 r/min, mass 3650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6316." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6316-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6316-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6316 M (machined brass cage, open arrangement) is the same-size execution on the 80×170×39 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316 shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316-2Z shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6316", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6316-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6316 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 80 mm bore gains dynamic rating through larger rolling elements on a 170 mm OD; the penalty is mass and a lower limiting speed than the 6216 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6316-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6316-2RS for that.", "Do not wash 6316-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6316-ZZ.", "SKF spells the shielded version 6316-2Z (one shield: 6316-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6316-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6316-2Z for high-contamination positions.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316-ZZ bearing?", "a": "A 6316-ZZ deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6316-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6316-ZZ need?", "a": "6316-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6316-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316-2Z — two non-contact sheet-metal shields, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 4300 r/min, mass 3750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6316-ZZ." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6316-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6316-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6316 M (machined brass cage, open arrangement) is the same-size execution on the 80×170×39 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316 shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316-2Z shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6316-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6316-2Z", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6316-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 170 mm outside diameter and 39 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6316-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6316 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 80 mm bore gains dynamic rating through larger rolling elements on a 170 mm OD; the penalty is mass and a lower limiting speed than the 6216 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6316-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6316-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6316-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6316-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6316-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6316-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6316-RS1 exists for arrangements that lubricate through the open side; fitting 6316-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316-2RS bearing?", "a": "A 6316-2RS deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6316-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6316-2RS need?", "a": "6316-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6316 with a housing grease fitting instead." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6316-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 2600 r/min, mass 3700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6316-2RS." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6316-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6316-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6316 M (machined brass cage, open arrangement) is the same-size execution on the 80×170×39 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316 shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316-2Z shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6316-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6316-2RS1", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6317 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 180 mm outside diameter and 41 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 85 mm of 6317 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "The open 6317 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×180×41 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6317 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 85 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6317.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6317-C3. No clearance suffix means normal CN clearance.", "The open 6317 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6317-2Z (shields) and 6317-2RSH (contact seals), not suffix-free 6317.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317 bearing?", "a": "A 6317 deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6317 mean?", "a": "A bare 6317 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6317 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6317 uses the same ISO 15 envelope (85×180×41 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6317?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317 — the open (unsealed) execution, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 5000 r/min, mass 4250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6317." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6317-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6317-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6317 M (machined brass cage, open arrangement) is the same-size execution on the 85×180×41 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317 shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317-2Z shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6317", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6317-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 85 mm of 6317-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "Do not wash 6317-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6317-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6317-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6317-2Z (one shield: 6317-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6317-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6317-2Z for high-contamination positions.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317-ZZ bearing?", "a": "A 6317-ZZ deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6317-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6317-ZZ need?", "a": "6317-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6317-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317-2Z — two non-contact sheet-metal shields, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 4000 r/min, mass 4400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6317-ZZ." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6317-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6317-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6317 M (machined brass cage, open arrangement) is the same-size execution on the 85×180×41 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317 shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317-2Z shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6317-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6317-2Z", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6317-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 85 mm of 6317-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "Heat is the enemy of the sealed 6317-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6317-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "The housing bore for the 180 mm OD should be round within IT7; an oval bore pinches the outer ring of 6317-2RS and shows up later as two-point loaded raceway wear.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6317-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6317-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6317-RS1 exists for arrangements that lubricate through the open side; fitting 6317-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317-2RS bearing?", "a": "A 6317-2RS deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6317 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6317 uses the same ISO 15 envelope (85×180×41 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6317-2RS have?", "a": "Unless a clearance suffix says otherwise, 6317-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6317 and verify the residual clearance after mounting." }, { "q": "How should 6317-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6317-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 2400 r/min, mass 4350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6317-2RS." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6317-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6317-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6317 M (machined brass cage, open arrangement) is the same-size execution on the 85×180×41 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317 shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317-2Z shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6317-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6317-2RS1", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium section at 90 mm bore gains dynamic rating through larger rolling elements on a 190 mm OD; the penalty is mass and a lower limiting speed than the 6218 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6318 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6318 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 43 mm-wide ring of 6318 drags the lip and overheats it.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6318 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6318-2Z (shields) and 6318-2RSH (contact seals), not suffix-free 6318.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318 bearing?", "a": "A 6318 deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6318 have?", "a": "Unless a clearance suffix says otherwise, 6318 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6318 and verify the residual clearance after mounting." }, { "q": "How should 6318 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6318 need?", "a": "The open 6318 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6318?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318 — the open (unsealed) execution, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 4800 r/min, mass 4950 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6318." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6318-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6318-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6318 M (machined brass cage, open arrangement) is the same-size execution on the 90×190×43 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318 shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318-2Z shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6318", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6318-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 190 mm outside diameter and 43 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6318-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 90 mm of 6318-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "ZZ shields are non-contact: 6318-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6318-2RS for that.", "Do not wash 6318-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6318-ZZ.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 6318-2Z (one shield: 6318-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6318-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6318-2Z for high-contamination positions.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318-ZZ bearing?", "a": "A 6318-ZZ deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6318-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 90 mm bore?", "a": "The '3' is the medium diameter series: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 6218 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6318 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6318 uses the same ISO 15 envelope (90×190×43 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6318-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318-2Z — two non-contact sheet-metal shields, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 3800 r/min, mass 5150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6318-ZZ." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6318-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6318-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6318 M (machined brass cage, open arrangement) is the same-size execution on the 90×190×43 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318 shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318-2Z shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6318-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6318-2Z", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6318-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6318 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 90 mm bore gains dynamic rating through larger rolling elements on a 190 mm OD; the penalty is mass and a lower limiting speed than the 6218 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6318-2RS runs slower and cooler-limited than the open 6318; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6318-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6318-2RS.", "Shaft and housing fillets must clear the bearing chamfer so the 43 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6318-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6318-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6318-RS1 exists for arrangements that lubricate through the open side; fitting 6318-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318-2RS bearing?", "a": "A 6318-2RS deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6318-2RS need?", "a": "6318-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6318 with a housing grease fitting instead." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6318-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6318-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 2400 r/min, mass 5100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6318-2RS." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6318-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6318-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6318 M (machined brass cage, open arrangement) is the same-size execution on the 90×190×43 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318 shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318-2Z shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6318-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6318-2RS1", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6319 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 95 mm of 6319 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 95 mm bore gains dynamic rating through larger rolling elements on a 200 mm OD; the penalty is mass and a lower limiting speed than the 6219 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6319 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6319 units.", "Never mix components between two 6319 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6319-C3. No clearance suffix means normal CN clearance.", "The open 6319 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6319-2Z (shields) and 6319-2RSH (contact seals), not suffix-free 6319.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319 bearing?", "a": "A 6319 deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6319 have?", "a": "Unless a clearance suffix says otherwise, 6319 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6319 and verify the residual clearance after mounting." }, { "q": "How should 6319 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6319 need?", "a": "The open 6319 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6319?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319 — the open (unsealed) execution, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 4500 r/min, mass 5750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6319." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6319-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6319-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6319 M (machined brass cage, open arrangement) is the same-size execution on the 95×200×45 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6319", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6319-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6319-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium section at 95 mm bore gains dynamic rating through larger rolling elements on a 200 mm OD; the penalty is mass and a lower limiting speed than the 6219 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6319-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6319-2RS for that.", "Do not wash 6319-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6319-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6319-2Z (one shield: 6319-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6319-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6319-2Z for high-contamination positions.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319-ZZ bearing?", "a": "A 6319-ZZ deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6300 compare with other series at the same 95 mm bore?", "a": "The '3' is the medium diameter series: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 6219 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6319 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6319 uses the same ISO 15 envelope (95×200×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6319-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6319-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6319 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6319-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319-2Z — two non-contact sheet-metal shields, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 3600 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6319-ZZ." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6319-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6319-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6319 M (machined brass cage, open arrangement) is the same-size execution on the 95×200×45 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6319-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6319-2Z", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6319-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6319-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 95 mm of 6319-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "Contact seals add drag and heat: 6319-2RS runs slower and cooler-limited than the open 6319; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6319-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6319-2RS.", "SKF catalogues the contact-sealed version as 6319-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7000 r/min thermal reference speed. The single-seal catalogue number is 6319-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6319-RS1 exists for arrangements that lubricate through the open side; fitting 6319-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319-2RS bearing?", "a": "A 6319-2RS deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6319-2RS need?", "a": "6319-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6319 with a housing grease fitting instead." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6319-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6319-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 2200 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6319-2RS." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6319-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6319-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6319 M (machined brass cage, open arrangement) is the same-size execution on the 95×200×45 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6319-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6319-2RS1", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "limiting_speed_rpm": 2200, "max_rpm": 2200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6320-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 7300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6320-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 215 mm outside diameter and 47 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6320-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 100 mm of 6320-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "ZZ shields are non-contact: 6320-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6320-2RS for that.", "Do not wash 6320-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6320-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6320-2Z (one shield: 6320-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6320-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6320-2Z for high-contamination positions.", "The 174/140 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6320-ZZ bearing?", "a": "A 6320-ZZ deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6320-ZZ need?", "a": "6320-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6320 bore code work?", "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6320-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6320-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6320-2Z — two non-contact sheet-metal shields, 100×215×47 mm per ISO 15. Quoted values: C 174 kN, C0 140 kN, Pu 4.75 kN, limiting speed 3400 r/min, mass 7300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6320-ZZ." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6320-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6320-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6320-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6320-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6320 M (machined brass cage, open arrangement) is the same-size execution on the 100×215×47 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6320-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6320-2Z", "material": "GCr15", "dynamic_load_kN": 174, "static_load_kN": 140, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6320-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 7200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6320-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 215 mm outside diameter and 47 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6320-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6320 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 100 mm bore gains dynamic rating through larger rolling elements on a 215 mm OD; the penalty is mass and a lower limiting speed than the 6220 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6320-2RS runs slower and cooler-limited than the open 6320; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6320-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6320-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6320-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life. The single-seal catalogue number is 6320-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6320-RS1 exists for arrangements that lubricate through the open side; fitting 6320-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 174/140 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6320-2RS bearing?", "a": "A 6320-2RS deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6320-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6320 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6320 uses the same ISO 15 envelope (100×215×47 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6320-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6320-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×215×47 mm per ISO 15. Quoted values: C 174 kN, C0 140 kN, Pu 4.75 kN, limiting speed 2000 r/min, mass 7200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6320-2RS." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6320-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6320-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6320-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6320-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "7320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6320 M (machined brass cage, open arrangement) is the same-size execution on the 100×215×47 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6320-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6320-2RS1", "material": "GCr15", "dynamic_load_kN": 174, "static_load_kN": 140, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 2000, "max_rpm": 2000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6321", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 8200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 6321 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier rolling elements also trade away some speed versus a 6221.", "Storage matters for open bearings: 6321 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6321 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6321.", "The housing bore for the 225 mm OD should be round within IT7; an oval bore pinches the outer ring of 6321 and shows up later as two-point loaded raceway wear.", "The open 6321 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6321-2Z (shields) and 6321-2RSH (contact seals), not suffix-free 6321.", "The 182/153 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6321 bearing?", "a": "A 6321 deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6321 need?", "a": "The open 6321 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6321 bore code work?", "a": "The last two digits of 6321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6321 mean?", "a": "A bare 6321 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6321?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6321 — the open (unsealed) execution, 105×225×49 mm per ISO 15. Quoted values: C 182 kN, C0 153 kN, Pu 5.1 kN, limiting speed 4000 r/min, mass 8200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6321." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6321-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6321-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6321-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6321-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "7321", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6321", "material": "GCr15", "dynamic_load_kN": 182, "static_load_kN": 153, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6321-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 8250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6321-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 225 mm outside diameter and 49 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6321-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier rolling elements also trade away some speed versus a 6221.", "Do not wash 6321-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6321-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 105 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6321-ZZ.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 6321-2Z (one shield: 6321-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6321-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6321-2Z for high-contamination positions.", "The 182/153 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6321-ZZ bearing?", "a": "A 6321-ZZ deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6321-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 105 mm bore?", "a": "The '3' is the medium diameter series: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 6221 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6321 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6321 uses the same ISO 15 envelope (105×225×49 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6321-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6321-2Z — two non-contact sheet-metal shields, 105×225×49 mm per ISO 15. Quoted values: C 182 kN, C0 153 kN, Pu 5.1 kN, limiting speed 3200 r/min, mass 8250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6321-ZZ." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6321-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6321-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6321-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "7321", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6321-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6321-2Z", "material": "GCr15", "dynamic_load_kN": 182, "static_load_kN": 153, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 6300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6322", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 9650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6322 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 110 mm bore gains dynamic rating through larger rolling elements on a 240 mm OD; the penalty is mass and a lower limiting speed than the 6222 — do not specify it for speed-critical shafts.", "The open 6322 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×240×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6322 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6322 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6322-2Z (shields) and 6322-2RSH (contact seals), not suffix-free 6322.", "The 203/180 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6322 bearing?", "a": "A 6322 deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6322 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6322 uses the same ISO 15 envelope (110×240×50 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6322 have?", "a": "Unless a clearance suffix says otherwise, 6322 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6322 and verify the residual clearance after mounting." }, { "q": "How should 6322 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6322?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6322 — the open (unsealed) execution, 110×240×50 mm per ISO 15. Quoted values: C 203 kN, C0 180 kN, Pu 5.7 kN, limiting speed 3800 r/min, mass 9650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6322." } ], "cross_ref": [ { "equiv_sku": "6322-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6322-RSR", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "7322", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6322-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6322 M (machined brass cage, open arrangement) is the same-size execution on the 110×240×50 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6322", "material": "GCr15", "dynamic_load_kN": 203, "static_load_kN": 180, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6004.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6004 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×42×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6004 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6004 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6004-2Z (shields) and 6004-2RSH (contact seals), not suffix-free 6004.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004 bearing?", "a": "A 6004 deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6004 mean?", "a": "A bare 6004 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 20 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6004?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004 — the open (unsealed) execution, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 24000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6004." } ], "cross_ref": [ { "equiv_sku": "6004-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6004-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2RS1 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2Z shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6004", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 71, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6004-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 42 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6004-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6004-ZZ.", "Choosing the 60xx extra-light section saves radial space at 20 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6204 before committing to the smaller envelope.", "ZZ shields are non-contact: 6004-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6004-2RS for that.", "Shielded 6004-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 6004-2Z (one shield: 6004-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6004-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6004-2Z for high-contamination positions.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-ZZ bearing?", "a": "A 6004-ZZ deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6004-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6004-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6004 and verify the residual clearance after mounting." }, { "q": "How should 6004-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6004-ZZ need?", "a": "6004-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6004-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2Z — two non-contact sheet-metal shields, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 71 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6004-ZZ." } ], "cross_ref": [ { "equiv_sku": "6004-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6004-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2RS1 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2Z shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6004-2Z", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6004-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "A 20 mm shaft for 6004 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Heat is the enemy of the sealed 6004-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6004-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Never mix components between two 6004-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the contact-sealed version as 6004-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 11000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6004-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6004-RSH exists for arrangements that lubricate through the open side; fitting 6004-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-2RS bearing?", "a": "A 6004-2RS deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6004-2RS need?", "a": "6004-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6004 with a housing grease fitting instead." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6004-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6004-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2RSH — two contact elastomer seals over a lifetime grease fill, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 11000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6004-2RS." } ], "cross_ref": [ { "equiv_sku": "6004-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6004-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2RS1 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2Z shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6004-2RSH", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 78, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Choosing the 60xx extra-light section saves radial space at 25 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6205 before committing to the smaller envelope.", "Storage matters for open bearings: 6005 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6005 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6005-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 25 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6005.", "The open 6005 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6005-2Z (shields) and 6005-2RSH (contact seals), not suffix-free 6005.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005 bearing?", "a": "A 6005 deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6005 need?", "a": "The open 6005 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6005 bore code work?", "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6005 mean?", "a": "A bare 6005 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6005?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005 — the open (unsealed) execution, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 20000 r/min, mass 78 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6005." } ], "cross_ref": [ { "equiv_sku": "6005-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6005-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6005-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6005-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6005-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6005-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2RS1 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2Z shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6005", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6005-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6005-ZZ.", "Choosing the 60xx extra-light section saves radial space at 25 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6205 before committing to the smaller envelope.", "Do not wash 6005-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6005-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6005-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 6005-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6005-2Z (one shield: 6005-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6005-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6005-2Z for high-contamination positions.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-ZZ bearing?", "a": "A 6005-ZZ deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6005 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6005 uses the same ISO 15 envelope (25×47×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6005-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6005-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6005 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6005-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2Z — two non-contact sheet-metal shields, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 16000 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6005-ZZ." } ], "cross_ref": [ { "equiv_sku": "6005-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6005-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6005-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6005-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6005-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2RS1 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2Z shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6005-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6005-2Z", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 81, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6005-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 47 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6005-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "A 25 mm shaft for 6005 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 25 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6205 before committing to the smaller envelope.", "Contact seals add drag and heat: 6005-2RS runs slower and cooler-limited than the open 6005; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6005-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6005-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6005-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed. The single-seal catalogue number is 6005-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6005-RSH exists for arrangements that lubricate through the open side; fitting 6005-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-2RS bearing?", "a": "A 6005-2RS deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6005-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6005 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6005 uses the same ISO 15 envelope (25×47×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6005-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2RSH — two contact elastomer seals over a lifetime grease fill, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 9500 r/min, mass 81 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6005-2RS." } ], "cross_ref": [ { "equiv_sku": "6005-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6005-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6005-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6005-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6005-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6005-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2RS1 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2Z shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6005-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6005-2RSH", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6006-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 55 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6006-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "A 30 mm shaft for 6006 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 30 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6206 before committing to the smaller envelope.", "Do not wash 6006-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6006-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6006-ZZ.", "The housing bore for the 55 mm OD should be round within IT7; an oval bore pinches the outer ring of 6006-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6006-2Z (one shield: 6006-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6006-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6006-2Z for high-contamination positions.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-ZZ bearing?", "a": "A 6006-ZZ deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6006 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6006 uses the same ISO 15 envelope (30×55×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6006-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6006-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6006 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6006-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2Z — two non-contact sheet-metal shields, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6006-ZZ." } ], "cross_ref": [ { "equiv_sku": "6006-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6006-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6006-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6006-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "W6006-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2RS1 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2Z shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6006-2Z", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6006-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6006-2RS runs slower and cooler-limited than the open 6006; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6006-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 6006-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 6006-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 6006-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8000 r/min limiting speed is set by seal-lip drag and grease life. The single-seal catalogue number is 6006-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6006-RS1 exists for arrangements that lubricate through the open side; fitting 6006-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-2RS bearing?", "a": "A 6006-2RS deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6006-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6006-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 8000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6006-2RS." } ], "cross_ref": [ { "equiv_sku": "6006-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6006-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6006-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6006-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W6006-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2RS1 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2Z shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6006-2RS1", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6007.", "Choosing the 60xx extra-light section saves radial space at 35 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6207 before committing to the smaller envelope.", "The open 6007 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×62×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6007 units.", "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 6007 and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6007.", "The open 6007 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6007-2Z (shields) and 6007-2RSH (contact seals), not suffix-free 6007.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007 bearing?", "a": "A 6007 deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6007 mean?", "a": "A bare 6007 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 35 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (62×14 mm, 13.5 mm radial section) at 35 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6007?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007 — the open (unsealed) execution, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6007." } ], "cross_ref": [ { "equiv_sku": "6007-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6007-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2RS1 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2Z shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6007", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6007-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6007-ZZ.", "Choosing the 60xx extra-light section saves radial space at 35 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6207 before committing to the smaller envelope.", "ZZ shields are non-contact: 6007-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6007-2RS for that.", "Shielded 6007-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6007-ZZ.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 6007-2Z (one shield: 6007-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6007-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6007-2Z for high-contamination positions.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-ZZ bearing?", "a": "A 6007-ZZ deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6007-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6007-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6007 and verify the residual clearance after mounting." }, { "q": "How should 6007-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6007-ZZ need?", "a": "6007-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6007-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2Z — two non-contact sheet-metal shields, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 12000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6007-ZZ." } ], "cross_ref": [ { "equiv_sku": "6007-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6007-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2RS1 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2Z shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6007-2Z", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6007-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 62 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6007-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6007-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Choosing the 60xx extra-light section saves radial space at 35 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6207 before committing to the smaller envelope.", "Contact seals add drag and heat: 6007-2RS runs slower and cooler-limited than the open 6007; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6007-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6007-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6007-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6007-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6007-RS1 exists for arrangements that lubricate through the open side; fitting 6007-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-2RS bearing?", "a": "A 6007-2RS deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6007-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6007-2RS need?", "a": "6007-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6007 with a housing grease fitting instead." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6007-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 7000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6007-2RS." } ], "cross_ref": [ { "equiv_sku": "6007-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6007-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2RS1 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2Z shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6007-2RS1", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Choosing the 60xx extra-light section saves radial space at 40 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6208 before committing to the smaller envelope.", "The open 6008 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×68×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6008 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The housing bore for the 68 mm OD should be round within IT7; an oval bore pinches the outer ring of 6008 and shows up later as two-point loaded raceway wear.", "The open 6008 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6008-2Z (shields) and 6008-2RSH (contact seals), not suffix-free 6008.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008 bearing?", "a": "A 6008 deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6008 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6008 uses the same ISO 15 envelope (40×68×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6008 have?", "a": "Unless a clearance suffix says otherwise, 6008 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6008 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6008?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008 — the open (unsealed) execution, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 14000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6008." } ], "cross_ref": [ { "equiv_sku": "6008-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6008-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2RS1 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2Z shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6008", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6008-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 68 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6008-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Do not wash 6008-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6008-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6008-2Z (one shield: 6008-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6008-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6008-2Z for high-contamination positions.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-ZZ bearing?", "a": "A 6008-ZZ deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6008-ZZ need?", "a": "6008-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6008-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6008-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2Z — two non-contact sheet-metal shields, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6008-ZZ." } ], "cross_ref": [ { "equiv_sku": "6008-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6008-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2RS1 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2Z shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6008-2Z", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6008-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 40 mm shaft for 6008 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 40 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6208 before committing to the smaller envelope.", "Contact seals add drag and heat: 6008-2RS runs slower and cooler-limited than the open 6008; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6008-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6008-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 22000 r/min thermal reference speed. The single-seal catalogue number is 6008-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6008-RS1 exists for arrangements that lubricate through the open side; fitting 6008-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-2RS bearing?", "a": "A 6008-2RS deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6008-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6008-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 6300 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6008-2RS." } ], "cross_ref": [ { "equiv_sku": "6008-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6008-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2RS1 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2Z shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6008-2RS1", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 240, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6009 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "A 45 mm shaft for 6009 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 45 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6209 before committing to the smaller envelope.", "Storage matters for open bearings: 6009 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6009 units.", "The housing bore for the 75 mm OD should be round within IT7; an oval bore pinches the outer ring of 6009 and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6009 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6009-2Z (shields) and 6009-2RSH (contact seals), not suffix-free 6009.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009 bearing?", "a": "A 6009 deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6009 need?", "a": "The open 6009 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6009 mean?", "a": "A bare 6009 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6009?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009 — the open (unsealed) execution, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 12000 r/min, mass 240 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6009." } ], "cross_ref": [ { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6009-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6009-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2RS1 shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2Z shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6009", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 20000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6009-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6009-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 45 mm shaft for 6009 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6009-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6009-2RS for that.", "Do not wash 6009-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6009-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6009-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6009-2Z (one shield: 6009-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6009-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6009-2Z for high-contamination positions.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009-ZZ bearing?", "a": "A 6009-ZZ deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6009-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 45 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6009 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6009 uses the same ISO 15 envelope (45×75×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6009-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009-2Z — two non-contact sheet-metal shields, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 10000 r/min, mass 250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6009-ZZ." } ], "cross_ref": [ { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6009-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6009-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2RS1 shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2Z shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6009-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6009-2Z", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6009-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6009-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6009-2RS runs slower and cooler-limited than the open 6009; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6009-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 6009-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6009-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6009-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6009-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6009-RS1 exists for arrangements that lubricate through the open side; fitting 6009-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009-2RS bearing?", "a": "A 6009-2RS deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6009 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6009 uses the same ISO 15 envelope (45×75×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6009-2RS have?", "a": "Unless a clearance suffix says otherwise, 6009-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6009 and verify the residual clearance after mounting." }, { "q": "How should 6009-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6009-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 5600 r/min, mass 250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6009-2RS." } ], "cross_ref": [ { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6009-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6009-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2RS1 shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2Z shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6009-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6009-2RS1", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 260, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6010 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6010 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6010 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×80×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6010 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6010 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6010-2Z (shields) and 6010-2RSH (contact seals), not suffix-free 6010.", "The 22.9/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010 bearing?", "a": "A 6010 deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6010 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6010 uses the same ISO 15 envelope (50×80×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6010 have?", "a": "Unless a clearance suffix says otherwise, 6010 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6010 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6010?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010 — the open (unsealed) execution, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 16 kN, Pu 0.71 kN, limiting speed 11000 r/min, mass 260 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6010." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2RS1 shares the 50×80×16 mm envelope but rates differently (22.9/16 kN vs 19/16.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2Z shares the 50×80×16 mm envelope but rates differently (22.9/16 kN vs 19/16.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6010", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 16, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6010-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6010-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6010-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6010-2RS for that.", "Do not wash 6010-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6010-2Z (one shield: 6010-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6010-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6010-2Z for high-contamination positions.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-ZZ bearing?", "a": "A 6010-ZZ deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6010-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6010-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6010 and verify the residual clearance after mounting." }, { "q": "How should 6010-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6010-ZZ need?", "a": "6010-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6010-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2Z — two non-contact sheet-metal shields, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 9000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6010-ZZ." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2RS1 shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2Z shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6010-2Z", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6010-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6010-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "Choosing the 60xx extra-light section saves radial space at 50 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6210 before committing to the smaller envelope.", "Contact seals add drag and heat: 6010-2RS runs slower and cooler-limited than the open 6010; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6010-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6010-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6010-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 18000 r/min thermal reference speed. The single-seal catalogue number is 6010-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6010-RS1 exists for arrangements that lubricate through the open side; fitting 6010-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-2RS bearing?", "a": "A 6010-2RS deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6010-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6010-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 5000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6010-2RS." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2RS1 shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2Z shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6010-2RS1", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6011 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6011 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6011 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×90×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6011 units.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6011 and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6011.", "The open 6011 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6011-2Z (shields) and 6011-2RSH (contact seals), not suffix-free 6011.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011 bearing?", "a": "A 6011 deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6011 have?", "a": "Unless a clearance suffix says otherwise, 6011 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6011 and verify the residual clearance after mounting." }, { "q": "How should 6011 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6011 need?", "a": "The open 6011 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6011?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011 — the open (unsealed) execution, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 10000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6011." } ], "cross_ref": [ { "equiv_sku": "6011-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6011-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6011 M (machined brass cage, open arrangement) is the same-size execution on the 55×90×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6011", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6011-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6011-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "Choosing the 60xx extra-light section saves radial space at 55 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6211 before committing to the smaller envelope.", "Do not wash 6011-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6011-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6011-ZZ.", "SKF spells the shielded version 6011-2Z (one shield: 6011-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6011-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6011-2Z for high-contamination positions.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011-ZZ bearing?", "a": "A 6011-ZZ deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6011-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 55 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6011-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011-2Z — two non-contact sheet-metal shields, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 8000 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6011-ZZ." } ], "cross_ref": [ { "equiv_sku": "6011-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6011-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6011 M (machined brass cage, open arrangement) is the same-size execution on the 55×90×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6011-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6011-2Z", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6011-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6011-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6011 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 55 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6211 before committing to the smaller envelope.", "Contact seals add drag and heat: 6011-2RS runs slower and cooler-limited than the open 6011; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6011-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6011-2RS drags the lip and overheats it.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6011-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed. The single-seal catalogue number is 6011-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6011-RS1 exists for arrangements that lubricate through the open side; fitting 6011-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011-2RS bearing?", "a": "A 6011-2RS deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6011-2RS need?", "a": "6011-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6011 with a housing grease fitting instead." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6011-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6011-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 4500 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6011-2RS." } ], "cross_ref": [ { "equiv_sku": "6011-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6011-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6011 M (machined brass cage, open arrangement) is the same-size execution on the 55×90×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6011-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6011-2RS1", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 410, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6012 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 60 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.", "The open 6012 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×95×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6012 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6012-C3. No clearance suffix means normal CN clearance.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6012 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6012-2Z (shields) and 6012-2RSH (contact seals), not suffix-free 6012.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012 bearing?", "a": "A 6012 deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6012 have?", "a": "Unless a clearance suffix says otherwise, 6012 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6012 and verify the residual clearance after mounting." }, { "q": "How should 6012 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6012 need?", "a": "The open 6012 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6012?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012 — the open (unsealed) execution, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 9500 r/min, mass 410 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6012." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6012", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6012-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 95 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6012-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6012 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 60 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.", "ZZ shields are non-contact: 6012-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6012-2RS for that.", "Do not wash 6012-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6012-ZZ drags the lip and overheats it.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6012-2Z (one shield: 6012-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6012-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6012-2Z for high-contamination positions.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-ZZ bearing?", "a": "A 6012-ZZ deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6012-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6012 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6012 uses the same ISO 15 envelope (60×95×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6012-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2Z — two non-contact sheet-metal shields, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 7500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6012-ZZ." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6012-2Z", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6012-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6012 against the shaft shoulder while it cools so the ring cannot creep back.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6012-2RS runs slower and cooler-limited than the open 6012; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6012-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6012-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 60 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6012-2RS.", "SKF catalogues the contact-sealed version as 6012-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6012-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6012-RS1 exists for arrangements that lubricate through the open side; fitting 6012-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-2RS bearing?", "a": "A 6012-2RS deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6012-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6012-2RS need?", "a": "6012-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6012 with a housing grease fitting instead." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6012-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 4300 r/min, mass 430 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6012-2RS." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6012-2RS1", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 440, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6013 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 100 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6013 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6013 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×100×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6013 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6013 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6013-2Z (shields) and 6013-2RSH (contact seals), not suffix-free 6013.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013 bearing?", "a": "A 6013 deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6013 have?", "a": "Unless a clearance suffix says otherwise, 6013 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6013 and verify the residual clearance after mounting." }, { "q": "How should 6013 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6013 need?", "a": "The open 6013 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6013?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013 — the open (unsealed) execution, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 9000 r/min, mass 440 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6013." } ], "cross_ref": [ { "equiv_sku": "6013-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6013-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6013-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6013-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6013-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6013 M (machined brass cage, open arrangement) is the same-size execution on the 65×100×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6013", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6013-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6013 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 65 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6213 before committing to the smaller envelope.", "ZZ shields are non-contact: 6013-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6013-2RS for that.", "Do not wash 6013-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6013-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF spells the shielded version 6013-2Z (one shield: 6013-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6013-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6013-2Z for high-contamination positions.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013-ZZ bearing?", "a": "A 6013-ZZ deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6013-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6013-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6013 and verify the residual clearance after mounting." }, { "q": "How should 6013-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6013-ZZ need?", "a": "6013-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6013-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013-2Z — two non-contact sheet-metal shields, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 7000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6013-ZZ." } ], "cross_ref": [ { "equiv_sku": "6013-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6013-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6013-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6013-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6013-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6013 M (machined brass cage, open arrangement) is the same-size execution on the 65×100×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6013-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6013-2Z", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6013-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 100 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6013-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6013 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 65 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6213 before committing to the smaller envelope.", "Contact seals add drag and heat: 6013-2RS runs slower and cooler-limited than the open 6013; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6013-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6013-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6013-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed. The single-seal catalogue number is 6013-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6013-RS1 exists for arrangements that lubricate through the open side; fitting 6013-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013-2RS bearing?", "a": "A 6013-2RS deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6013-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6013-2RS need?", "a": "6013-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6013 with a housing grease fitting instead." }, { "q": "How does the 6013 bore code work?", "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6013-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 4000 r/min, mass 450 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6013-2RS." } ], "cross_ref": [ { "equiv_sku": "6013-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6013-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6013-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6013-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6013 M (machined brass cage, open arrangement) is the same-size execution on the 65×100×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6013-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6013-2RS1", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6014 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6014 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 70 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6214 before committing to the smaller envelope.", "The open 6014 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×110×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6014 units.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6014.", "The housing bore for the 110 mm OD should be round within IT7; an oval bore pinches the outer ring of 6014 and shows up later as two-point loaded raceway wear.", "The open 6014 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6014-2Z (shields) and 6014-2RSH (contact seals), not suffix-free 6014.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014 bearing?", "a": "A 6014 deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6014 need?", "a": "The open 6014 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6014 mean?", "a": "A bare 6014 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6014?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014 — the open (unsealed) execution, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 8000 r/min, mass 610 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6014." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6014-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6014-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6014 M (machined brass cage, open arrangement) is the same-size execution on the 70×110×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6014", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6014-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6014-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6014 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6014-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6014-2RS for that.", "Do not wash 6014-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6014-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6014-2Z (one shield: 6014-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6014-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6014-2Z for high-contamination positions.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014-ZZ bearing?", "a": "A 6014-ZZ deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6014 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6014 uses the same ISO 15 envelope (70×110×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6014-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6014-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6014 and verify the residual clearance after mounting." }, { "q": "How should 6014-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6014-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014-2Z — two non-contact sheet-metal shields, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 6300 r/min, mass 640 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6014-ZZ." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6014-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6014-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6014 M (machined brass cage, open arrangement) is the same-size execution on the 70×110×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6014-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6014-2Z", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 630, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6014-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6014 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 70 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6214 before committing to the smaller envelope.", "Heat is the enemy of the sealed 6014-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6014-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6014-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6014-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6014-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6014-RS1 exists for arrangements that lubricate through the open side; fitting 6014-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014-2RS bearing?", "a": "A 6014-2RS deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 70 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (110×20 mm, 20.0 mm radial section) at 70 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6014 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6014 uses the same ISO 15 envelope (70×110×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6014-2RS have?", "a": "Unless a clearance suffix says otherwise, 6014-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6014 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6014-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 3600 r/min, mass 630 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6014-2RS." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6014-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6014-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6014 M (machined brass cage, open arrangement) is the same-size execution on the 70×110×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6014-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6014-2RS1", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6015 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6015 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "The open 6015 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×115×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6015 units.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6015 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6015-2Z (shields) and 6015-2RSH (contact seals), not suffix-free 6015.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015 bearing?", "a": "A 6015 deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6015 have?", "a": "Unless a clearance suffix says otherwise, 6015 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6015 and verify the residual clearance after mounting." }, { "q": "How should 6015 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6015 need?", "a": "The open 6015 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6015?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015 — the open (unsealed) execution, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 7500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6015." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6015 M (machined brass cage, open arrangement) is the same-size execution on the 75×115×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6015", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 680, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6015-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6015-2Z.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6015 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "ZZ shields are non-contact: 6015-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6015-2RS for that.", "Do not wash 6015-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 115 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6015-ZZ.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6015-2Z (one shield: 6015-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6015-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6015-2Z for high-contamination positions.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-ZZ bearing?", "a": "A 6015-ZZ deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6015 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6015 uses the same ISO 15 envelope (75×115×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6015-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6015-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6015 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6015-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2Z — two non-contact sheet-metal shields, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 6000 r/min, mass 680 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6015-ZZ." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6015 M (machined brass cage, open arrangement) is the same-size execution on the 75×115×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6015-2Z", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6015-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "Contact seals add drag and heat: 6015-2RS runs slower and cooler-limited than the open 6015; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6015-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6015-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 115 mm OD should be round within IT7; an oval bore pinches the outer ring of 6015-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 6015-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed. The single-seal catalogue number is 6015-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6015-RS1 exists for arrangements that lubricate through the open side; fitting 6015-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-2RS bearing?", "a": "A 6015-2RS deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6015 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6015 uses the same ISO 15 envelope (75×115×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6015-2RS have?", "a": "Unless a clearance suffix says otherwise, 6015-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6015 and verify the residual clearance after mounting." }, { "q": "How should 6015-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6015-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 3400 r/min, mass 670 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6015-2RS." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6015 M (machined brass cage, open arrangement) is the same-size execution on the 75×115×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6015-2RS1", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6016 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 80 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6216 before committing to the smaller envelope.", "Storage matters for open bearings: 6016 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6016 units.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6016.", "The open 6016 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6016-2Z (shields) and 6016-2RSH (contact seals), not suffix-free 6016.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016 bearing?", "a": "A 6016 deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6016 have?", "a": "Unless a clearance suffix says otherwise, 6016 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6016 and verify the residual clearance after mounting." }, { "q": "How should 6016 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6016?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016 — the open (unsealed) execution, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 7000 r/min, mass 860 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6016." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6016-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6016-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6016", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 890, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6016-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6016 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 80 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6216 before committing to the smaller envelope.", "ZZ shields are non-contact: 6016-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6016-2RS for that.", "Do not wash 6016-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6016-ZZ.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6016-2Z (one shield: 6016-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6016-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6016-2Z for high-contamination positions.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016-ZZ bearing?", "a": "A 6016-ZZ deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6016-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6016-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6016 and verify the residual clearance after mounting." }, { "q": "How should 6016-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6016-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016-2Z — two non-contact sheet-metal shields, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 5600 r/min, mass 890 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6016-ZZ." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6016-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6016-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6016-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6016-2Z", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6016-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6016-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6016 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6016-2RS runs slower and cooler-limited than the open 6016; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6016-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6016-2RS.", "The housing bore for the 125 mm OD should be round within IT7; an oval bore pinches the outer ring of 6016-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 6016-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6016-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6016-RS1 exists for arrangements that lubricate through the open side; fitting 6016-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016-2RS bearing?", "a": "A 6016-2RS deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6016-2RS have?", "a": "Unless a clearance suffix says otherwise, 6016-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6016 and verify the residual clearance after mounting." }, { "q": "How should 6016-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6016-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 3200 r/min, mass 880 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6016-2RS." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6016-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6016-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6016-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6016-2RS1", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6017 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 130 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 85 mm of 6017 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6017 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×130×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6017 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 6017 and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6017-C3. No clearance suffix means normal CN clearance.", "The open 6017 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6017-2Z (shields) and 6017-2RSH (contact seals), not suffix-free 6017.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017 bearing?", "a": "A 6017 deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6017 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6017 uses the same ISO 15 envelope (85×130×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6017 have?", "a": "Unless a clearance suffix says otherwise, 6017 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6017 and verify the residual clearance after mounting." }, { "q": "How should 6017 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6017?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017 — the open (unsealed) execution, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 6700 r/min, mass 900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6017." } ], "cross_ref": [ { "equiv_sku": "6017-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6017-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6017-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6017-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6017", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 940, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6017-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 130 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6017-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 85 mm of 6017-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Do not wash 6017-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6017-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6017-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6017-2Z (one shield: 6017-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6017-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6017-2Z for high-contamination positions.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017-ZZ bearing?", "a": "A 6017-ZZ deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6017-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6017-ZZ need?", "a": "6017-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6017 bore code work?", "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6017-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017-2Z — two non-contact sheet-metal shields, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 5300 r/min, mass 940 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6017-ZZ." } ], "cross_ref": [ { "equiv_sku": "6017-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6017-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6017-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6017-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6017-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6017-2Z", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6017-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 130 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6017-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6017-2RS runs slower and cooler-limited than the open 6017; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6017-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6017-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6017-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6017-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6017-RS1 exists for arrangements that lubricate through the open side; fitting 6017-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017-2RS bearing?", "a": "A 6017-2RS deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6017 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6017 uses the same ISO 15 envelope (85×130×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6017-2RS have?", "a": "Unless a clearance suffix says otherwise, 6017-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6017 and verify the residual clearance after mounting." }, { "q": "How should 6017-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6017-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 3000 r/min, mass 930 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6017-2RS." } ], "cross_ref": [ { "equiv_sku": "6017-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6017-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6017-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6017-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6017-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6017-2RS1", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6018 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×140×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6018 units.", "The housing bore for the 140 mm OD should be round within IT7; an oval bore pinches the outer ring of 6018 and shows up later as two-point loaded raceway wear.", "Never mix components between two 6018 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6018 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6018-2Z (shields) and 6018-2RSH (contact seals), not suffix-free 6018.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018 bearing?", "a": "A 6018 deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6018 need?", "a": "The open 6018 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6018 bore code work?", "a": "The last two digits of 6018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6018 mean?", "a": "A bare 6018 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6018?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018 — the open (unsealed) execution, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 6300 r/min, mass 1150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6018." } ], "cross_ref": [ { "equiv_sku": "6018-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6018-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6018-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6018-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6018-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6018 M (machined brass cage, open arrangement) is the same-size execution on the 90×140×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6018", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6018-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 140 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6018-2Z.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 90 mm of 6018-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 90 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6218 before committing to the smaller envelope.", "Do not wash 6018-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6018-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 140 mm OD should be round within IT7; an oval bore pinches the outer ring of 6018-ZZ and shows up later as two-point loaded raceway wear.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6018-2Z (one shield: 6018-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6018-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6018-2Z for high-contamination positions.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018-ZZ bearing?", "a": "A 6018-ZZ deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6018-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6018-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6018 and verify the residual clearance after mounting." }, { "q": "How should 6018-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6018-ZZ need?", "a": "6018-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6018-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018-2Z — two non-contact sheet-metal shields, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 5000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6018-ZZ." } ], "cross_ref": [ { "equiv_sku": "6018-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6018-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6018-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6018-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6018-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6018 M (machined brass cage, open arrangement) is the same-size execution on the 90×140×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6018-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6018-2Z", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6018-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 140 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6018-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 90 mm of 6018-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 90 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6218 before committing to the smaller envelope.", "Contact seals add drag and heat: 6018-2RS runs slower and cooler-limited than the open 6018; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6018-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 6018-2RS drags the lip and overheats it.", "Vibration during standstill brinells the raceways of a 90 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6018-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6018-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6018-RS1 exists for arrangements that lubricate through the open side; fitting 6018-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018-2RS bearing?", "a": "A 6018-2RS deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6018 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6018 uses the same ISO 15 envelope (90×140×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6018-2RS have?", "a": "Unless a clearance suffix says otherwise, 6018-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6018 and verify the residual clearance after mounting." }, { "q": "How should 6018-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6018-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 2800 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6018-2RS." } ], "cross_ref": [ { "equiv_sku": "6018-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6018-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6018-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6018-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6018-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6018 M (machined brass cage, open arrangement) is the same-size execution on the 90×140×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6018-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6018-2RS1", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 6019 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 95 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6219 before committing to the smaller envelope.", "The open 6019 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×145×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6019 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6019.", "The open 6019 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6019-2Z (shields) and 6019-2RSH (contact seals), not suffix-free 6019.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019 bearing?", "a": "A 6019 deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6019 mean?", "a": "A bare 6019 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 95 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (145×24 mm, 25.0 mm radial section) at 95 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6019 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6019 uses the same ISO 15 envelope (95×145×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6019?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019 — the open (unsealed) execution, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 6000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6019." } ], "cross_ref": [ { "equiv_sku": "6019-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6019-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6019-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6019-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6019", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6019-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 145 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6019-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 95 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6219 before committing to the smaller envelope.", "ZZ shields are non-contact: 6019-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6019-2RS for that.", "Shielded 6019-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6019-2Z (one shield: 6019-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6019-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6019-2Z for high-contamination positions.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019-ZZ bearing?", "a": "A 6019-ZZ deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6019 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6019 uses the same ISO 15 envelope (95×145×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6019-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6019-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6019 and verify the residual clearance after mounting." }, { "q": "How should 6019-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6019-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019-2Z — two non-contact sheet-metal shields, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 4800 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6019-ZZ." } ], "cross_ref": [ { "equiv_sku": "6019-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6019-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6019-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6019-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6019-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6019-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6019-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 145 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6019-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6019-2RS runs slower and cooler-limited than the open 6019; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6019-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 6019-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 6019-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019-2RS bearing?", "a": "A 6019-2RS deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6019-2RS have?", "a": "Unless a clearance suffix says otherwise, 6019-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6019 and verify the residual clearance after mounting." }, { "q": "How should 6019-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6019-2RS need?", "a": "6019-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6019 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6019-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 2800 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6019-2RS." } ], "cross_ref": [ { "equiv_sku": "6019-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6019-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6019-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6019-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6019-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6019-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6020 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×150×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6020 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6020-C3. No clearance suffix means normal CN clearance.", "The open 6020 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6020-2Z (shields) and 6020-2RSH (contact seals), not suffix-free 6020.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020 bearing?", "a": "A 6020 deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6020 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6020 uses the same ISO 15 envelope (100×150×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6020 have?", "a": "Unless a clearance suffix says otherwise, 6020 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6020 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6020?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020 — the open (unsealed) execution, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 5600 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6020." } ], "cross_ref": [ { "equiv_sku": "6020-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6020-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6020-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6020-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6020-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6020 M (machined brass cage, open arrangement) is the same-size execution on the 100×150×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6020", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6020-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 150 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6020-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6020 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 100 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6220 before committing to the smaller envelope.", "Do not wash 6020-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6020-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6020-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6020-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6020-2Z (one shield: 6020-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6020-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6020-2Z for high-contamination positions.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020-ZZ bearing?", "a": "A 6020-ZZ deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6020 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6020 uses the same ISO 15 envelope (100×150×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6020-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6020-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6020 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6020-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020-2Z — two non-contact sheet-metal shields, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 4500 r/min, mass 1300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6020-ZZ." } ], "cross_ref": [ { "equiv_sku": "6020-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6020-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6020-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6020-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6020-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6020 M (machined brass cage, open arrangement) is the same-size execution on the 100×150×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6020-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6020-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6020-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6020 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6020-2RS runs slower and cooler-limited than the open 6020; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6020-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6020-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 6020-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6020-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6020-RS1 exists for arrangements that lubricate through the open side; fitting 6020-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020-2RS bearing?", "a": "A 6020-2RS deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6020 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6020 uses the same ISO 15 envelope (100×150×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6020-2RS have?", "a": "Unless a clearance suffix says otherwise, 6020-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6020 and verify the residual clearance after mounting." }, { "q": "How should 6020-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6020-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 2600 r/min, mass 1300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6020-2RS." } ], "cross_ref": [ { "equiv_sku": "6020-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6020-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6020-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6020-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6020-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6020 M (machined brass cage, open arrangement) is the same-size execution on the 100×150×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6020-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6020-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6404", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 20, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 410, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6404 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 72 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6404; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 20 mm bore (72 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6404 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6404 units.", "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 6404 and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6400-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6404 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6404-2Z (shields) and 6404-2RSH (contact seals), not suffix-free 6404.", "The 30.7/15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6404 bearing?", "a": "A 6404 deep-groove ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6404 bore code work?", "a": "The last two digits of 6404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6404 mean?", "a": "A bare 6404 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 20 mm bore?", "a": "The '4' is the heavy diameter series: 72×19 mm, 26.0 mm radial section at 20 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6404?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6404 — the open (unsealed) execution, 20×72×19 mm per ISO 15. Quoted values: C 30.7 kN, C0 15 kN, Pu 0.64 kN, limiting speed 15000 r/min, mass 410 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6404." } ], "cross_ref": [ { "equiv_sku": "6404-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6404-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6404-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6404-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6404", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 15, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6405", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 25, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 540, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6405.", "The 64xx heavy section at 25 mm bore exists for high radial load at moderate rpm; its 80 mm OD and 21 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Storage matters for open bearings: 6405 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6405 units.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 6405 and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 25 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6405 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6405-2Z (shields) and 6405-2RSH (contact seals), not suffix-free 6405.", "The 35.8/19.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6405 bearing?", "a": "A 6405 deep-groove ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6405 bore code work?", "a": "The last two digits of 6405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6405 mean?", "a": "A bare 6405 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 25 mm bore?", "a": "The '4' is the heavy diameter series: 80×21 mm, 27.5 mm radial section at 25 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6405?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6405 — the open (unsealed) execution, 25×80×21 mm per ISO 15. Quoted values: C 35.8 kN, C0 19.3 kN, Pu 0.815 kN, limiting speed 13000 r/min, mass 540 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6405." } ], "cross_ref": [ { "equiv_sku": "6405-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6405-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6405-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6405-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6405", "material": "GCr15", "dynamic_load_kN": 35.8, "static_load_kN": 19.3, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6406", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 30, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6406.", "The 64xx heavy section at 30 mm bore exists for high radial load at moderate rpm; its 90 mm OD and 23 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Storage matters for open bearings: 6406 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6406 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6406.", "The open 6406 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6406-2Z (shields) and 6406-2RSH (contact seals), not suffix-free 6406.", "The 43.6/23.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6406 bearing?", "a": "A 6406 deep-groove ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6406 need?", "a": "The open 6406 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6406 bore code work?", "a": "The last two digits of 6406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6406 mean?", "a": "A bare 6406 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6406?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6406 — the open (unsealed) execution, 30×90×23 mm per ISO 15. Quoted values: C 43.6 kN, C0 23.6 kN, Pu 1 kN, limiting speed 11000 r/min, mass 750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6406." } ], "cross_ref": [ { "equiv_sku": "6406-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6406-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6406-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6406-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6406", "material": "GCr15", "dynamic_load_kN": 43.6, "static_load_kN": 23.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6407", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 35, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 970, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6407.", "The 64xx heavy section at 35 mm bore (100 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6407 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6407 units.", "Never mix components between two 6407 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 25 mm-wide ring of 6407 drags the lip and overheats it.", "The open 6407 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6407-2Z (shields) and 6407-2RSH (contact seals), not suffix-free 6407.", "The 55.3/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6407 bearing?", "a": "A 6407 deep-groove ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6407 mean?", "a": "A bare 6407 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 35 mm bore?", "a": "The '4' is the heavy diameter series: 100×25 mm, 32.5 mm radial section at 35 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6407 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6407 uses the same ISO 15 envelope (35×100×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6407?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6407 — the open (unsealed) execution, 35×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31 kN, Pu 1.29 kN, limiting speed 10000 r/min, mass 970 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6407." } ], "cross_ref": [ { "equiv_sku": "6407-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6407-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6407-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6407-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6407", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6408", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 40, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6408 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 110 mm outside diameter and 27 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "A 40 mm shaft for 6408 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 64xx heavy section at 40 mm bore (110 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6408 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6408 units.", "Never mix components between two 6408 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6400-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6408 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6408-2Z (shields) and 6408-2RSH (contact seals), not suffix-free 6408.", "The 63.7/36.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6408 bearing?", "a": "A 6408 deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6408 bore code work?", "a": "The last two digits of 6408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6408 mean?", "a": "A bare 6408 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 40 mm bore?", "a": "The '4' is the heavy diameter series: 110×27 mm, 35.0 mm radial section at 40 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6408?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6408 — the open (unsealed) execution, 40×110×27 mm per ISO 15. Quoted values: C 63.7 kN, C0 36.5 kN, Pu 1.53 kN, limiting speed 9000 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6408." } ], "cross_ref": [ { "equiv_sku": "6408-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6408-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6408-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6408-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6408", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 36.5, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6409", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 45, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6409.", "The 64xx heavy section at 45 mm bore (120 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6409 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6409 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 29 mm-wide ring of 6409 drags the lip and overheats it.", "The open 6409 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6409-2Z (shields) and 6409-2RSH (contact seals), not suffix-free 6409.", "The 76.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6409 bearing?", "a": "A 6409 deep-groove ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6409 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6409 need?", "a": "The open 6409 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6409 bore code work?", "a": "The last two digits of 6409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6409?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6409 — the open (unsealed) execution, 45×120×29 mm per ISO 15. Quoted values: C 76.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 8500 r/min, mass 1550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6409." } ], "cross_ref": [ { "equiv_sku": "6409-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6409-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6409-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6409", "material": "GCr15", "dynamic_load_kN": 76.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6410", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 50, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6410 with C3 for those conditions.", "The 64xx heavy section at 50 mm bore exists for high radial load at moderate rpm; its 130 mm OD and 31 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "The open 6410 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6410 units.", "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 6410 and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6410 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6410-2Z (shields) and 6410-2RSH (contact seals), not suffix-free 6410.", "The 87.1/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6410 bearing?", "a": "A 6410 deep-groove ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6410 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6410 need?", "a": "The open 6410 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6410 bore code work?", "a": "The last two digits of 6410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6410?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6410 — the open (unsealed) execution, 50×130×31 mm per ISO 15. Quoted values: C 87.1 kN, C0 52 kN, Pu 2.2 kN, limiting speed 7500 r/min, mass 1950 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6410." } ], "cross_ref": [ { "equiv_sku": "6410-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6410-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6410-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6410", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6411", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 55, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6411 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6411 with C3 for those conditions.", "The 64xx heavy section at 55 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6411 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6411 units.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6400-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6411 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6411-2Z (shields) and 6411-2RSH (contact seals), not suffix-free 6411.", "The 99.5/62 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6411 bearing?", "a": "A 6411 deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6411 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6411 need?", "a": "The open 6411 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6411 bore code work?", "a": "The last two digits of 6411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6411?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6411 — the open (unsealed) execution, 55×140×33 mm per ISO 15. Quoted values: C 99.5 kN, C0 62 kN, Pu 2.6 kN, limiting speed 7000 r/min, mass 2350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6411." } ], "cross_ref": [ { "equiv_sku": "6411-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6411-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6411-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6411-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6411", "material": "GCr15", "dynamic_load_kN": 99.5, "static_load_kN": 62, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6412", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 60, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6412 with C3 for those conditions.", "The 64xx heavy section at 60 mm bore (150 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6412 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6412 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 35 mm-wide ring of 6412 drags the lip and overheats it.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6412 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6412-2Z (shields) and 6412-2RSH (contact seals), not suffix-free 6412.", "The 108/69.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6412 bearing?", "a": "A 6412 deep-groove ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6400 compare with other series at the same 60 mm bore?", "a": "The '4' is the heavy diameter series: 150×35 mm, 45.0 mm radial section at 60 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6412 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6412 uses the same ISO 15 envelope (60×150×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6412 have?", "a": "Unless a clearance suffix says otherwise, 6412 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6412 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6412?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6412 — the open (unsealed) execution, 60×150×35 mm per ISO 15. Quoted values: C 108 kN, C0 69.5 kN, Pu 2.9 kN, limiting speed 6300 r/min, mass 2850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6412." } ], "cross_ref": [ { "equiv_sku": "6412-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6412-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6412-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6412", "material": "GCr15", "dynamic_load_kN": 108, "static_load_kN": 69.5, "fatigue_load_limit_kN": 2.9, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6413", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 65, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6413 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 160 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6413 against the shaft shoulder while it cools so the ring cannot creep back.", "The 64xx heavy section at 65 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6413 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6413 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 37 mm-wide ring of 6413 drags the lip and overheats it.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6413 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6413-2Z (shields) and 6413-2RSH (contact seals), not suffix-free 6413.", "The 119/78 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6413 bearing?", "a": "A 6413 deep-groove ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6413 mean?", "a": "A bare 6413 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 65 mm bore?", "a": "The '4' is the heavy diameter series: 160×37 mm, 47.5 mm radial section at 65 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6413 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6413 uses the same ISO 15 envelope (65×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6413?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6413 — the open (unsealed) execution, 65×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 78 kN, Pu 3.15 kN, limiting speed 6000 r/min, mass 3350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6413." } ], "cross_ref": [ { "equiv_sku": "6413-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6413-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6413-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6413", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 78, "fatigue_load_limit_kN": 3.15, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6414", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 70, "D_mm": 180, "B_mm": 42, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6414 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 180 mm outside diameter and 42 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6414 with C3 clearance and re-check the residual value after mounting.", "The 64xx heavy section at 70 mm bore exists for high radial load at moderate rpm; its 180 mm OD and 42 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "The open 6414 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×180×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6414 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6414-C3. No clearance suffix means normal CN clearance.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6414 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6414-2Z (shields) and 6414-2RSH (contact seals), not suffix-free 6414.", "The 143/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6414 bearing?", "a": "A 6414 deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6414 bore code work?", "a": "The last two digits of 6414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6414 mean?", "a": "A bare 6414 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 70 mm bore?", "a": "The '4' is the heavy diameter series: 180×42 mm, 55.0 mm radial section at 70 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6414?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6414 — the open (unsealed) execution, 70×180×42 mm per ISO 15. Quoted values: C 143 kN, C0 104 kN, Pu 3.9 kN, limiting speed 5300 r/min, mass 4950 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6414." } ], "cross_ref": [ { "equiv_sku": "6414-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6414-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6414-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6414", "material": "GCr15", "dynamic_load_kN": 143, "static_load_kN": 104, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61904 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 37 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61904 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×37×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61904 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 20 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61904.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61904 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61904-2Z (shields) and 61904-2RSH (contact seals), not suffix-free 61904.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904 bearing?", "a": "A 61904 deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61904 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61904 need?", "a": "The open 61904 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61904?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904 — the open (unsealed) execution, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 26000 r/min, mass 37 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61904." } ], "cross_ref": [ { "equiv_sku": "61904-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61904-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904-2RS1 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61904", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61904", "material": "GCr15", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "reference_speed_rpm": 43000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61904-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "A 20 mm shaft for 61904 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Heat is the enemy of the sealed 61904-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61904-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61904-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 61904-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61904-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 43000 r/min thermal reference speed.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904-2RS bearing?", "a": "A 61904-2RS deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61904-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with an 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61904-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904-2RS1 — two contact elastomer seals over a lifetime grease fill, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 12000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61904-2RS." } ], "cross_ref": [ { "equiv_sku": "61904-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61904-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904-2RS1 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61904", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61904-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61904-2RS1", "material": "GCr15", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "A 25 mm shaft for 61905 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61905 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×42×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61905 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61905.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61905-C3. No clearance suffix means normal CN clearance.", "The open 61905 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61905-2Z (shields) and 61905-2RSH (contact seals), not suffix-free 61905.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905 bearing?", "a": "A 61905 deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61905 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61905 need?", "a": "The open 61905 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61905 bore code work?", "a": "The last two digits of 61905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61905?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905 — the open (unsealed) execution, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 22000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61905." } ], "cross_ref": [ { "equiv_sku": "61905-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61905-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61905-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61905-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61905-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61905-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61905-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61905-2RS1 shares the 25×42×9 mm envelope but rates differently (7.02/4.3 kN vs 6.05/4.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61905", "material": "GCr15", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "reference_speed_rpm": 36000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61905-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "A 25 mm shaft for 61905 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section at 25 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61905-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61905-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61905-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 10000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 36000 r/min thermal reference speed.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905-2RS bearing?", "a": "A 61905-2RS deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61905-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 25 mm bore?", "a": "619 is a thin section one step above 618: 42×9 mm with an 8.5 mm radial section at 25 mm bore; a 6205 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61905 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61905 uses the same ISO 15 envelope (25×42×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61905-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905-2RS1 — two contact elastomer seals over a lifetime grease fill, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 10000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61905-2RS." } ], "cross_ref": [ { "equiv_sku": "61905-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61905-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61905-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61905-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61905-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61905-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61905-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61905-2RS1 shares the 25×42×9 mm envelope but rates differently (7.02/4.3 kN vs 6.05/4.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61905-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61905-2RS1", "material": "GCr15", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 49, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61906 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 47 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 30 mm shaft for 61906 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61906 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×47×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61906 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61906 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61906-2Z (shields) and 61906-2RSH (contact seals), not suffix-free 61906.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906 bearing?", "a": "A 61906 deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61906 have?", "a": "Unless a clearance suffix says otherwise, 61906 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61906 and verify the residual clearance after mounting." }, { "q": "How should 61906 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61906 need?", "a": "The open 61906 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61906?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906 — the open (unsealed) execution, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 49 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61906." } ], "cross_ref": [ { "equiv_sku": "61906-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61906-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906-2RS1 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61906", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61906", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 30000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 51, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61906-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 47 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61906-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "A 30 mm shaft for 61906 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61906-2RS runs slower and cooler-limited than the open 61906; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61906-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 61906-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61906-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906-2RS bearing?", "a": "A 61906-2RS deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61906-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with an 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61906 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61906 uses the same ISO 15 envelope (30×47×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61906-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 8500 r/min, mass 51 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61906-2RS." } ], "cross_ref": [ { "equiv_sku": "61906-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61906-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906-2RS1 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61906", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61906-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61906-2RS1", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61907 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×55×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61907 units.", "Never mix components between two 61907 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61907 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61907-2Z (shields) and 61907-2RSH (contact seals), not suffix-free 61907.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907 bearing?", "a": "A 61907 deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61907 mean?", "a": "A bare 61907 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61907 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61907 uses the same ISO 15 envelope (35×55×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61907?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907 — the open (unsealed) execution, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 16000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61907." } ], "cross_ref": [ { "equiv_sku": "61907-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61907-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61907-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61907-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61907-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61907-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61907-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61907-2RS1 shares the 35×55×10 mm envelope but rates differently (10.8/7.8 kN vs 9.36/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61907", "material": "GCr15", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "reference_speed_rpm": 26000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61907-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "A 35 mm shaft for 61907 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section at 35 mm bore (10.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61907-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61907-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61907-2RS.", "Never mix components between two 61907-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the contact-sealed version as 61907-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 26000 r/min thermal reference speed.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907-2RS bearing?", "a": "A 61907-2RS deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61907-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61907 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61907 uses the same ISO 15 envelope (35×55×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61907-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 7500 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61907-2RS." } ], "cross_ref": [ { "equiv_sku": "61907-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61907-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61907-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61907-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61907-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61907-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61907-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61907-2RS1 shares the 35×55×10 mm envelope but rates differently (10.8/7.8 kN vs 9.36/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61907-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61907-2RS1", "material": "GCr15", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61908 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 62 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61908; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61908 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×62×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61908 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 61908 and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61908 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61908-2Z (shields) and 61908-2RSH (contact seals), not suffix-free 61908.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908 bearing?", "a": "A 61908 deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61908 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61908 uses the same ISO 15 envelope (40×62×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61908 have?", "a": "Unless a clearance suffix says otherwise, 61908 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61908 and verify the residual clearance after mounting." }, { "q": "How should 61908 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61908?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908 — the open (unsealed) execution, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61908." } ], "cross_ref": [ { "equiv_sku": "61908-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61908-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61908-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61908-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61908-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61908-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61908-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61908-2RS1 shares the 40×62×12 mm envelope but rates differently (13.8/10 kN vs 11.9/9.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61908", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "reference_speed_rpm": 24000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61908-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61908-2RS.", "The 619xx thin section at 40 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61908-2RS runs slower and cooler-limited than the open 61908; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61908-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 61908-2RS drags the lip and overheats it.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61908-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908-2RS bearing?", "a": "A 61908-2RS deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61908-2RS need?", "a": "61908-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61908 with a housing grease fitting instead." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61908-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61908-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 6700 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61908-2RS." } ], "cross_ref": [ { "equiv_sku": "61908-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61908-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61908-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61908-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61908-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61908-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61908-2RS1 shares the 40×62×12 mm envelope but rates differently (13.8/10 kN vs 11.9/9.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61908-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61908-2RS1", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61909 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 68 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61909 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×68×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61909 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61909 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61909-2Z (shields) and 61909-2RSH (contact seals), not suffix-free 61909.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909 bearing?", "a": "A 61909 deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61909 need?", "a": "The open 61909 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61909 mean?", "a": "A bare 61909 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61909?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909 — the open (unsealed) execution, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 13000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61909." } ], "cross_ref": [ { "equiv_sku": "61909-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61909-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61909-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61909-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61909-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61909-2RS1 shares the 45×68×12 mm envelope but rates differently (14/10.8 kN vs 12.1/10.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61909", "material": "GCr15", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61909-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 68 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61909-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section at 45 mm bore (11.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61909-2RS runs slower and cooler-limited than the open 61909; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61909-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 45 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 61909-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61909-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909-2RS bearing?", "a": "A 61909-2RS deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61909-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61909-2RS need?", "a": "61909-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61909 with a housing grease fitting instead." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61909-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 6000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61909-2RS." } ], "cross_ref": [ { "equiv_sku": "61909-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61909-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61909-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61909-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61909-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61909-2RS1 shares the 45×68×12 mm envelope but rates differently (14/10.8 kN vs 12.1/10.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61909-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61909-2RS1", "material": "GCr15", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61910 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 72 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61910 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61910 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×72×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61910 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61910 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61910 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61910-2Z (shields) and 61910-2RSH (contact seals), not suffix-free 61910.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910 bearing?", "a": "A 61910 deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61910 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61910 uses the same ISO 15 envelope (50×72×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61910 have?", "a": "Unless a clearance suffix says otherwise, 61910 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61910 and verify the residual clearance after mounting." }, { "q": "How should 61910 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61910?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910 — the open (unsealed) execution, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 12000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61910." } ], "cross_ref": [ { "equiv_sku": "61910-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61910-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61910-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61910-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61910-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61910", "material": "GCr15", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61910-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61910 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 50 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61910-2RS runs slower and cooler-limited than the open 61910; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61910-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61910-2RS.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 61910-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910-2RS bearing?", "a": "A 61910-2RS deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61910-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with an 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61910 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61910 uses the same ISO 15 envelope (50×72×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61910-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 5600 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61910-2RS." } ], "cross_ref": [ { "equiv_sku": "61910-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61910-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61910-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61910-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61910-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61910-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61910-2RS1", "material": "GCr15", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61911 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61911 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×80×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61911 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61911-C3. No clearance suffix means normal CN clearance.", "The open 61911 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61911-2Z (shields) and 61911-2RSH (contact seals), not suffix-free 61911.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911 bearing?", "a": "A 61911 deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61911 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61911 uses the same ISO 15 envelope (55×80×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61911 have?", "a": "Unless a clearance suffix says otherwise, 61911 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61911 and verify the residual clearance after mounting." }, { "q": "How should 61911 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61911?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911 — the open (unsealed) execution, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 11000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61911." } ], "cross_ref": [ { "equiv_sku": "61911-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-RSR-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61911", "material": "GCr15", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61911-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 80 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61911-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61911 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61911-2RS runs slower and cooler-limited than the open 61911; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61911-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 61911-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 61911-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911-2RS bearing?", "a": "A 61911-2RS deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61911-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61911-2RS need?", "a": "61911-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61911 with a housing grease fitting instead." }, { "q": "How does the 61911 bore code work?", "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61911-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 5000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61911-2RS." } ], "cross_ref": [ { "equiv_sku": "61911-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61911-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61911-2RS1", "material": "GCr15", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804", "brand": "SKF", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61804.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 20 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6204.", "The open 61804 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×32×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61804 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 20 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61804 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61804-2Z (shields) and 61804-2RSH (contact seals), not suffix-free 61804.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804 bearing?", "a": "A 61804 deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61804 have?", "a": "Unless a clearance suffix says otherwise, 61804 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61804 and verify the residual clearance after mounting." }, { "q": "How should 61804 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61804 need?", "a": "The open 61804 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61804?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804 — the open (unsealed) execution, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 28000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61804." } ], "cross_ref": [ { "equiv_sku": "61804-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61804-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2RS1 shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61804-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2Z shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61804", "material": "GCr15", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804-2RS", "brand": "SKF", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61804-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 20 mm shaft for 61804 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 20 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6204.", "Heat is the enemy of the sealed 61804-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61804-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 61804-2RS and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61804-2RS.", "SKF catalogues the contact-sealed version as 61804-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804-2RS bearing?", "a": "A 61804-2RS deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61804-2RS need?", "a": "61804-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61804 with a housing grease fitting instead." }, { "q": "How does the 61804 bore code work?", "a": "The last two digits of 61804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61804-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61804-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804-2RS1 — two contact elastomer seals over a lifetime grease fill, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 13000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61804-2RS." } ], "cross_ref": [ { "equiv_sku": "61804-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61804-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2RS1 shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61804-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2Z shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61804-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61804-2RS1", "material": "GCr15", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000", "brand": "SKF", "manufacturer_designation": "SKF 6000", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "Choosing the 60xx extra-light section saves radial space at 10 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6200 before committing to the smaller envelope.", "The open 6000 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×26×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6000 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6000-C3. No clearance suffix means normal CN clearance.", "The open 6000 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6000-2Z (shields) and 6000-2RSH (contact seals), not suffix-free 6000.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000 bearing?", "a": "A 6000 deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6000 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6000 uses the same ISO 15 envelope (10×26×8 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6000 have?", "a": "Unless a clearance suffix says otherwise, 6000 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6000 and verify the residual clearance after mounting." }, { "q": "How should 6000 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6000?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000 — the open (unsealed) execution, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 40000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000." } ], "cross_ref": [ { "equiv_sku": "6000-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6000-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2RS1 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2Z shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6000-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6000-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 26 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6000-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Codes 00–03 are the exception series: 6000 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 10 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6200 before committing to the smaller envelope.", "Contact seals add drag and heat: 6000-2RS runs slower and cooler-limited than the open 6000; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6000-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6000-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6000-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 19000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 67000 r/min thermal reference speed. The single-seal catalogue number is 6000-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6000-RSH exists for arrangements that lubricate through the open side; fitting 6000-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-2RS bearing?", "a": "A 6000-2RS deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6000-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2RSH — two contact elastomer seals over a lifetime grease fill, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 19000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-2RS." } ], "cross_ref": [ { "equiv_sku": "6000-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6000-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2RS1 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2Z shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6000-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6000-2RSL.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "Choosing the 60xx extra-light section saves radial space at 10 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6200 before committing to the smaller envelope.", "RSR low-friction seals on 6000-RSR run faster than contact-seal 6000-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6000-2RS instead.", "The low-drag lip of 6000-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6000-RSR.", "SKF catalogues the low-friction seal as 6000-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 34000 r/min limiting speed, closer to the open bearing's 67000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-RSR bearing?", "a": "A 6000-RSR deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6000-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2RSL — two low-friction non-contact elastomer seals, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 34000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-RSR." } ], "cross_ref": [ { "equiv_sku": "6000-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2RS1 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2Z shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6000-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 20, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6000-2Z.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Miniature bearings like 6000-ZZ (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6200; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6000-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6000-2RS for that.", "Shielded 6000-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6000-2Z (one shield: 6000-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6000-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6000-2Z for high-contamination positions.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-ZZ bearing?", "a": "A 6000-ZZ deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6000-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6000-ZZ need?", "a": "6000-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6000-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2Z — two non-contact sheet-metal shields, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 34000 r/min, mass 20 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-ZZ." } ], "cross_ref": [ { "equiv_sku": "6000-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2RS1 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2Z shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001", "brand": "SKF", "manufacturer_designation": "SKF 6001", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 21, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6001 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 28 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Miniature bearings like 6001 (12 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6201; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6001 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×28×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6001 units.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6001 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6001-2Z (shields) and 6001-2RSH (contact seals), not suffix-free 6001.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001 bearing?", "a": "A 6001 deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6001 mean?", "a": "A bare 6001 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 12 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6001?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001 — the open (unsealed) execution, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 38000 r/min, mass 21 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001." } ], "cross_ref": [ { "equiv_sku": "6001-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2RS1 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2Z shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6001-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6001-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Codes 00–03 are the exception series: 6001 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 12 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6201 before committing to the smaller envelope.", "Contact seals add drag and heat: 6001-2RS runs slower and cooler-limited than the open 6001; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6001-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6001-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 60000 r/min thermal reference speed. The single-seal catalogue number is 6001-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6001-RSH exists for arrangements that lubricate through the open side; fitting 6001-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-2RS bearing?", "a": "A 6001-2RS deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6001-2RS have?", "a": "Unless a clearance suffix says otherwise, 6001-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6001 and verify the residual clearance after mounting." }, { "q": "How should 6001-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6001-2RS need?", "a": "6001-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6001 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6001-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2RSH — two contact elastomer seals over a lifetime grease fill, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 17000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-2RS." } ], "cross_ref": [ { "equiv_sku": "6001-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2RS1 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2Z shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6001-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 21, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6001-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 28 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6001-2RSL.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Codes 00–03 are the exception series: 6001 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 12 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6201 before committing to the smaller envelope.", "The low-drag lip of 6001-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6001-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6001-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 30000 r/min limiting speed, closer to the open bearing's 60000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-RSR bearing?", "a": "A 6001-RSR deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6001-RSR have?", "a": "Unless a clearance suffix says otherwise, 6001-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6001 and verify the residual clearance after mounting." }, { "q": "How should 6001-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6001-RSR need?", "a": "6001-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6001 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6001-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2RSL — two low-friction non-contact elastomer seals, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 30000 r/min, mass 21 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-RSR." } ], "cross_ref": [ { "equiv_sku": "6001-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2RS1 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2Z shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6001-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6001-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 28 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6001-2Z.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "Choosing the 60xx extra-light section saves radial space at 12 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6201 before committing to the smaller envelope.", "ZZ shields are non-contact: 6001-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6001-2RS for that.", "Do not wash 6001-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6001-2Z (one shield: 6001-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6001-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6001-2Z for high-contamination positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-ZZ bearing?", "a": "A 6001-ZZ deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6001-ZZ need?", "a": "6001-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6001-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6001-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2Z — two non-contact sheet-metal shields, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 30000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-ZZ." } ], "cross_ref": [ { "equiv_sku": "6001-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2RS1 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2Z shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002", "brand": "SKF", "manufacturer_designation": "SKF 6002", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Codes 00–03 are the exception series: 6002 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 15 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6202 before committing to the smaller envelope.", "The open 6002 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×32×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6002 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 6002 and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6002.", "The open 6002 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6002-2Z (shields) and 6002-2RSH (contact seals), not suffix-free 6002.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002 bearing?", "a": "A 6002 deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6002 mean?", "a": "A bare 6002 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6002 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6002 uses the same ISO 15 envelope (15×32×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6002?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002 — the open (unsealed) execution, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 32000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002." } ], "cross_ref": [ { "equiv_sku": "6002-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2RS1 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2Z shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6002-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6002-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 32 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6002-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Codes 00–03 are the exception series: 6002 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6202; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Heat is the enemy of the sealed 6002-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6002-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6002-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6002-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6002-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6002-RSH exists for arrangements that lubricate through the open side; fitting 6002-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-2RS bearing?", "a": "A 6002-2RS deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6002 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6002 uses the same ISO 15 envelope (15×32×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6002-2RS have?", "a": "Unless a clearance suffix says otherwise, 6002-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6002 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6002-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2RSH — two contact elastomer seals over a lifetime grease fill, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 14000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-2RS." } ], "cross_ref": [ { "equiv_sku": "6002-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2RS1 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2Z shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6002-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6002-2RSL.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Codes 00–03 are the exception series: 6002 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 15 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6202 before committing to the smaller envelope.", "RSR low-friction seals on 6002-RSR run faster than contact-seal 6002-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6002-2RS instead.", "The non-contact lip of 6002-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6002-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 6002-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-RSR bearing?", "a": "A 6002-RSR deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6002-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6002-RSR need?", "a": "6002-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6002 with a housing grease fitting instead." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6002-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2RSL — two low-friction non-contact elastomer seals, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 26000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-RSR." } ], "cross_ref": [ { "equiv_sku": "6002-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2RS1 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2Z shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6002-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6002-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 32 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6002-2Z.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Codes 00–03 are the exception series: 6002 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 15 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6202 before committing to the smaller envelope.", "ZZ shields are non-contact: 6002-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6002-2RS for that.", "Shielded 6002-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 6002-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6002-2Z (one shield: 6002-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6002-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6002-2Z for high-contamination positions.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-ZZ bearing?", "a": "A 6002-ZZ deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6002-ZZ need?", "a": "6002-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6002-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6002-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2Z — two non-contact sheet-metal shields, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 26000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-ZZ." } ], "cross_ref": [ { "equiv_sku": "6002-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2RS1 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2Z shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003", "brand": "SKF", "manufacturer_designation": "SKF 6003", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6003 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 35 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6003 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6003 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6003-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 35 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6003.", "The open 6003 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6003-2Z (shields) and 6003-2RSH (contact seals), not suffix-free 6003.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003 bearing?", "a": "A 6003 deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6003 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6003 uses the same ISO 15 envelope (17×35×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6003 have?", "a": "Unless a clearance suffix says otherwise, 6003 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6003 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6003?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003 — the open (unsealed) execution, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 28000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003." } ], "cross_ref": [ { "equiv_sku": "6003-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2RS1 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2Z shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6003-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6003-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "Choosing the 60xx extra-light section saves radial space at 17 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6203 before committing to the smaller envelope.", "Contact seals add drag and heat: 6003-2RS runs slower and cooler-limited than the open 6003; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6003-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6003-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed. The single-seal catalogue number is 6003-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6003-RSH exists for arrangements that lubricate through the open side; fitting 6003-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-2RS bearing?", "a": "A 6003-2RS deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6003-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6003-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2RSH — two contact elastomer seals over a lifetime grease fill, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 13000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-2RS." } ], "cross_ref": [ { "equiv_sku": "6003-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2RS1 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2Z shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6003-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6003-2RSL.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "Choosing the 60xx extra-light section saves radial space at 17 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6203 before committing to the smaller envelope.", "The low-drag lip of 6003-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6003-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6003-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-RSR bearing?", "a": "A 6003-RSR deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6003-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6003 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6003 uses the same ISO 15 envelope (17×35×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6003-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2RSL — two low-friction non-contact elastomer seals, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 22000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-RSR." } ], "cross_ref": [ { "equiv_sku": "6003-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2RS1 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2Z shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6003-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 41, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6003-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 35 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6003-2Z.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Miniature bearings like 6003-ZZ (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Do not wash 6003-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6003-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 35 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6003-ZZ.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6003-2Z (one shield: 6003-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6003-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6003-2Z for high-contamination positions.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-ZZ bearing?", "a": "A 6003-ZZ deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6003-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6003 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6003 uses the same ISO 15 envelope (17×35×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6003-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2Z — two non-contact sheet-metal shields, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 22000 r/min, mass 41 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-ZZ." } ], "cross_ref": [ { "equiv_sku": "6003-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2RS1 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2Z shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6004-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 69, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6004-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 42 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6004-2RSL.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6004-RSR.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6004-RSR run faster than contact-seal 6004-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6004-2RS instead.", "The non-contact lip of 6004-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6004-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 6004-RSR and shows up later as two-point loaded raceway wear.", "SKF catalogues the low-friction seal as 6004-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-RSR bearing?", "a": "A 6004-RSR deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6004-RSR have?", "a": "Unless a clearance suffix says otherwise, 6004-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6004 and verify the residual clearance after mounting." }, { "q": "How should 6004-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6004-RSR need?", "a": "6004-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6004 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6004-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2RSL — two low-friction non-contact elastomer seals, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 69 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6004-RSR." } ], "cross_ref": [ { "equiv_sku": "6004-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6004-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2RS1 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2Z shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6005-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6005-2RSL.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6005-RSR run faster than contact-seal 6005-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6005-2RS instead.", "The non-contact lip of 6005-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6005-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the low-friction seal as 6005-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 16000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-RSR bearing?", "a": "A 6005-RSR deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6005-RSR have?", "a": "Unless a clearance suffix says otherwise, 6005-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6005 and verify the residual clearance after mounting." }, { "q": "How should 6005-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6005-RSR need?", "a": "6005-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6005 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6005-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2RSL — two low-friction non-contact elastomer seals, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 16000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6005-RSR." } ], "cross_ref": [ { "equiv_sku": "6005-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6005-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6005-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6005-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6005-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6005-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2RS1 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2Z shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6005-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6006-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6006-2RZ.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 30 mm shaft for 6006 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 30 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6206 before committing to the smaller envelope.", "The low-drag lip of 6006-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6006-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6006-RSR.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6006-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 14000 r/min limiting speed. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-RSR bearing?", "a": "A 6006-RSR deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6006-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6006-RSR need?", "a": "6006-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6006 with a housing grease fitting instead." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6006-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2RZ — two low-friction non-contact elastomer seals, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6006-RSR." } ], "cross_ref": [ { "equiv_sku": "6006-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6006-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6006-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6006-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W6006-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2RS1 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2Z shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6007-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6007-2RZ.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "A 35 mm shaft for 6007 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6007-RSR run faster than contact-seal 6007-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6007-2RS instead.", "The low-drag lip of 6007-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 6007-RSR and shows up later as two-point loaded raceway wear.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6007-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-RSR bearing?", "a": "A 6007-RSR deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6007-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6007-RSR need?", "a": "6007-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6007 with a housing grease fitting instead." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6007-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2RZ — two low-friction non-contact elastomer seals, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 12000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6007-RSR." } ], "cross_ref": [ { "equiv_sku": "6007-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6007-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2RS1 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2Z shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6008-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6008-2RZ.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "A 40 mm shaft for 6008 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 40 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6208 before committing to the smaller envelope.", "RSR low-friction seals on 6008-RSR run faster than contact-seal 6008-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6008-2RS instead.", "The non-contact lip of 6008-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6008-C3. No clearance suffix means normal CN clearance.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 6008-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 22000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-RSR bearing?", "a": "A 6008-RSR deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6008-RSR have?", "a": "Unless a clearance suffix says otherwise, 6008-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6008 and verify the residual clearance after mounting." }, { "q": "How should 6008-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6008-RSR need?", "a": "6008-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6008 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6008-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2RZ — two low-friction non-contact elastomer seals, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6008-RSR." } ], "cross_ref": [ { "equiv_sku": "6008-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6008-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2RS1 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2Z shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6010-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6010-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6010-2RZ.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6010 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 50 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6210 before committing to the smaller envelope.", "The low-drag lip of 6010-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6010-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6010-RSR.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 6010-RSR and shows up later as two-point loaded raceway wear.", "SKF catalogues the low-friction seal as 6010-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9000 r/min limiting speed, closer to the open bearing's 18000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-RSR bearing?", "a": "A 6010-RSR deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6010-RSR need?", "a": "6010-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6010 with a housing grease fitting instead." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6010-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 6010-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2RZ — two low-friction non-contact elastomer seals, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 9000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6010-RSR." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2RS1 shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2Z shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6012-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6012-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 95 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6012-2RZ.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6012-RSR run faster than contact-seal 6012-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6012-2RS instead.", "The non-contact lip of 6012-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6012-RSR drags the lip and overheats it.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6012-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-RSR bearing?", "a": "A 6012-RSR deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6012 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6012 uses the same ISO 15 envelope (60×95×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6012-RSR have?", "a": "Unless a clearance suffix says otherwise, 6012-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6012 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6012-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2RZ — two low-friction non-contact elastomer seals, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 7500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6012-RSR." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6015-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6015-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6015-2RZ.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The low-drag lip of 6015-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6015-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 6015-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6015-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6015-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-RSR bearing?", "a": "A 6015-RSR deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6015-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6015 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6015 uses the same ISO 15 envelope (75×115×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6015-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2RZ — two low-friction non-contact elastomer seals, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 6000 r/min, mass 670 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6015-RSR." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6015 M (machined brass cage, open arrangement) is the same-size execution on the 75×115×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021", "brand": "SKF", "manufacturer_designation": "SKF 6021", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 1600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 105 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6221 before committing to the smaller envelope.", "The open 6021 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×160×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6021 units.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6021 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6021-2Z (shields) and 6021-2RSH (contact seals), not suffix-free 6021.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021 bearing?", "a": "A 6021 deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6021 bore code work?", "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6021 mean?", "a": "A bare 6021 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6021?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021 — the open (unsealed) execution, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 5300 r/min, mass 1600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021." } ], "cross_ref": [ { "equiv_sku": "6021-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6021-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6021-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6021-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6021-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6021 M (machined brass cage, open arrangement) is the same-size execution on the 105×160×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6021-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6021-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 6021 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 105 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6221 before committing to the smaller envelope.", "Contact seals add drag and heat: 6021-2RS runs slower and cooler-limited than the open 6021; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6021-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6021-2RS and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 105 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6021-2RS.", "SKF catalogues the contact-sealed version as 6021-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6021-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6021-RS1 exists for arrangements that lubricate through the open side; fitting 6021-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021-2RS bearing?", "a": "A 6021-2RS deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6021 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6021 uses the same ISO 15 envelope (105×160×26 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6021-2RS have?", "a": "Unless a clearance suffix says otherwise, 6021-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6021 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6021-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021-2RS1 — two contact elastomer seals over a lifetime grease fill, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 2400 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021-2RS." } ], "cross_ref": [ { "equiv_sku": "6021-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6021-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6021-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6021-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6021-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6021 M (machined brass cage, open arrangement) is the same-size execution on the 105×160×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6021-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6021-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6021-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 105 mm of 6021-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 105 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6221 before committing to the smaller envelope.", "ZZ shields are non-contact: 6021-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6021-2RS for that.", "Shielded 6021-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6021-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6021-2Z (one shield: 6021-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6021-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6021-2Z for high-contamination positions.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021-ZZ bearing?", "a": "A 6021-ZZ deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6021-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6021-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6021 and verify the residual clearance after mounting." }, { "q": "How should 6021-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6021-ZZ need?", "a": "6021-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6021-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021-2Z — two non-contact sheet-metal shields, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 4300 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021-ZZ." } ], "cross_ref": [ { "equiv_sku": "6021-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6021-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6021-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6021-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6021-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6021 M (machined brass cage, open arrangement) is the same-size execution on the 105×160×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6021-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022", "brand": "SKF", "manufacturer_designation": "SKF 6022", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6022 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6022 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×170×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6022 units.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6022 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6022-2Z (shields) and 6022-2RSH (contact seals), not suffix-free 6022.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022 bearing?", "a": "A 6022 deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6022 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6022 need?", "a": "The open 6022 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6022 bore code work?", "a": "The last two digits of 6022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6022?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022 — the open (unsealed) execution, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 5000 r/min, mass 1950 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022." } ], "cross_ref": [ { "equiv_sku": "6022-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6022-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6022-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6022-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6022-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6022 M (machined brass cage, open arrangement) is the same-size execution on the 110×170×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6022-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 2000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6022-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 170 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6022-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 110 mm of 6022-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 110 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6222 before committing to the smaller envelope.", "Contact seals add drag and heat: 6022-2RS runs slower and cooler-limited than the open 6022; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6022-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 28 mm-wide ring of 6022-2RS drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6022-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6022-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6022-RS1 exists for arrangements that lubricate through the open side; fitting 6022-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022-2RS bearing?", "a": "A 6022-2RS deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6022 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6022 uses the same ISO 15 envelope (110×170×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6022-2RS have?", "a": "Unless a clearance suffix says otherwise, 6022-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6022 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6022-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 2400 r/min, mass 2000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022-2RS." } ], "cross_ref": [ { "equiv_sku": "6022-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6022-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6022-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6022-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6022-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6022 M (machined brass cage, open arrangement) is the same-size execution on the 110×170×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6022-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6022-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6022-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 170 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6022-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 110 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6222 before committing to the smaller envelope.", "Do not wash 6022-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6022-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6022-2Z (one shield: 6022-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6022-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6022-2Z for high-contamination positions.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022-ZZ bearing?", "a": "A 6022-ZZ deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6022-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6022 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6022 uses the same ISO 15 envelope (110×170×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6022-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022-2Z — two non-contact sheet-metal shields, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 4000 r/min, mass 2050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022-ZZ." } ], "cross_ref": [ { "equiv_sku": "6022-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6022-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6022-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6022-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6022-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6022 M (machined brass cage, open arrangement) is the same-size execution on the 110×170×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6022-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024", "brand": "SKF", "manufacturer_designation": "SKF 6024", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 2100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 120 mm of 6024 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6024 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×180×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6024 units.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6024 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6024-2Z (shields) and 6024-2RSH (contact seals), not suffix-free 6024.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024 bearing?", "a": "A 6024 deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6024 need?", "a": "The open 6024 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6024 mean?", "a": "A bare 6024 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6024?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024 — the open (unsealed) execution, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 4800 r/min, mass 2100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6024-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6024-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 6024 MA (machined brass cage, open arrangement) is the same-size execution on the 120×180×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6024-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6024-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 120 mm of 6024-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 120 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6224 before committing to the smaller envelope.", "Contact seals add drag and heat: 6024-2RS runs slower and cooler-limited than the open 6024; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6024-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6024-C3. No clearance suffix means normal CN clearance.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6024-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6024-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6024-RS1 exists for arrangements that lubricate through the open side; fitting 6024-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024-2RS bearing?", "a": "A 6024-2RS deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6024-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6024-2RS need?", "a": "6024-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6024 with a housing grease fitting instead." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6024-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 2200 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024-2RS." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6024-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6024-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 6024 MA (machined brass cage, open arrangement) is the same-size execution on the 120×180×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6024-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6024-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 2200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6024-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6024-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6024-2RS for that.", "Do not wash 6024-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6024-2Z (one shield: 6024-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6024-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6024-2Z for high-contamination positions.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024-ZZ bearing?", "a": "A 6024-ZZ deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6024-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6024-ZZ need?", "a": "6024-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6024-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024-2Z — two non-contact sheet-metal shields, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 3800 r/min, mass 2200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024-ZZ." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6024-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6024-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 6024 MA (machined brass cage, open arrangement) is the same-size execution on the 120×180×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6024-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026", "brand": "SKF", "manufacturer_designation": "SKF 6026", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 130 mm of 6026 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6026 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×200×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6026 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6026-C3. No clearance suffix means normal CN clearance.", "The open 6026 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6026-2Z (shields) and 6026-2RSH (contact seals), not suffix-free 6026.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026 bearing?", "a": "A 6026 deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6026 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6026 need?", "a": "The open 6026 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6026 bore code work?", "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6026?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026 — the open (unsealed) execution, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 4300 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026." } ], "cross_ref": [ { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6026 M (machined brass cage, open arrangement) is the same-size execution on the 130×200×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6026-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6026-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 130 mm of 6026-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 130 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6226 before committing to the smaller envelope.", "Contact seals add drag and heat: 6026-2RS runs slower and cooler-limited than the open 6026; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6026-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6026-2RS.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6026-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7000 r/min thermal reference speed. The single-seal catalogue number is 6026-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6026-RS1 exists for arrangements that lubricate through the open side; fitting 6026-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026-2RS bearing?", "a": "A 6026-2RS deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6026 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6026 uses the same ISO 15 envelope (130×200×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6026-2RS have?", "a": "Unless a clearance suffix says otherwise, 6026-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6026 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6026-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 2000 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026-2RS." } ], "cross_ref": [ { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6026 M (machined brass cage, open arrangement) is the same-size execution on the 130×200×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6026-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6026-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 3350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6026-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 200 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6026-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 6026 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 130 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6226 before committing to the smaller envelope.", "Do not wash 6026-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6026-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6026-2Z (one shield: 6026-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6026-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6026-2Z for high-contamination positions.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026-ZZ bearing?", "a": "A 6026-ZZ deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6026-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6026 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6026 uses the same ISO 15 envelope (130×200×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6026-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026-2Z — two non-contact sheet-metal shields, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 3400 r/min, mass 3350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026-ZZ." } ], "cross_ref": [ { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6026 M (machined brass cage, open arrangement) is the same-size execution on the 130×200×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6026-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028", "brand": "SKF", "manufacturer_designation": "SKF 6028", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 140 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6228 before committing to the smaller envelope.", "Storage matters for open bearings: 6028 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6028 units.", "Never mix components between two 6028 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6028.", "The open 6028 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6028-2Z (shields) and 6028-2RSH (contact seals), not suffix-free 6028.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028 bearing?", "a": "A 6028 deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6028 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6028 need?", "a": "The open 6028 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6028?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028 — the open (unsealed) execution, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 4000 r/min, mass 3450 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028." } ], "cross_ref": [ { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6028 M (machined brass cage, open arrangement) is the same-size execution on the 140×210×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6028-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 3550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6028-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 140 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6228 before committing to the smaller envelope.", "Contact seals add drag and heat: 6028-2RS runs slower and cooler-limited than the open 6028; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6028-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6028-2RS.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6028-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6700 r/min thermal reference speed. The single-seal catalogue number is 6028-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6028-RS1 exists for arrangements that lubricate through the open side; fitting 6028-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028-2RS bearing?", "a": "A 6028-2RS deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6028-2RS need?", "a": "6028-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6028 with a housing grease fitting instead." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6028-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6028-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028-2RS1 — two contact elastomer seals over a lifetime grease fill, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 1800 r/min, mass 3550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028-2RS." } ], "cross_ref": [ { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6028 M (machined brass cage, open arrangement) is the same-size execution on the 140×210×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6028-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6028-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 3550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6028-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 6028 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6028-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6028-2RS for that.", "Shielded 6028-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6028-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF spells the shielded version 6028-2Z (one shield: 6028-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6028-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6028-2Z for high-contamination positions.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028-ZZ bearing?", "a": "A 6028-ZZ deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6028-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6028-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6028 and verify the residual clearance after mounting." }, { "q": "How should 6028-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6028-ZZ need?", "a": "6028-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6028-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028-2Z — two non-contact sheet-metal shields, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 3200 r/min, mass 3550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028-ZZ." } ], "cross_ref": [ { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6028 M (machined brass cage, open arrangement) is the same-size execution on the 140×210×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6028-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030", "brand": "SKF", "manufacturer_designation": "SKF 6030", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 4300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 150 mm of 6030 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6030 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×225×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6030 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6030 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6030-2Z (shields) and 6030-2RSH (contact seals), not suffix-free 6030.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030 bearing?", "a": "A 6030 deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6030 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6030 need?", "a": "The open 6030 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6030?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030 — the open (unsealed) execution, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 3800 r/min, mass 4300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030." } ], "cross_ref": [ { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6030-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6030-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6030 M (machined brass cage, open arrangement) is the same-size execution on the 150×225×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6030-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 4350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6030-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6030-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 150 mm of 6030-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Heat is the enemy of the sealed 6030-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6030-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6030-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6000 r/min thermal reference speed. The single-seal catalogue number is 6030-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6030-RS1 exists for arrangements that lubricate through the open side; fitting 6030-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030-2RS bearing?", "a": "A 6030-2RS deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6030 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6030 uses the same ISO 15 envelope (150×225×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6030-2RS have?", "a": "Unless a clearance suffix says otherwise, 6030-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6030 and verify the residual clearance after mounting." }, { "q": "How should 6030-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6030-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030-2RS1 — two contact elastomer seals over a lifetime grease fill, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 1700 r/min, mass 4350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030-2RS." } ], "cross_ref": [ { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6030-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6030-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6030 M (machined brass cage, open arrangement) is the same-size execution on the 150×225×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6030-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6030-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 4400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6030-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6030-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 6030 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 150 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6230 before committing to the smaller envelope.", "ZZ shields are non-contact: 6030-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6030-2RS for that.", "Do not wash 6030-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6030-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6030-2Z (one shield: 6030-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6030-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6030-2Z for high-contamination positions.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030-ZZ bearing?", "a": "A 6030-ZZ deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6030-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6030-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030-2Z — two non-contact sheet-metal shields, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 3000 r/min, mass 4400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030-ZZ." } ], "cross_ref": [ { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6030 M (machined brass cage, open arrangement) is the same-size execution on the 150×225×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6030-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032", "brand": "SKF", "manufacturer_designation": "SKF 6032", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 5200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6032 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6032 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×240×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6032 units.", "The housing bore for the 240 mm OD should be round within IT7; an oval bore pinches the outer ring of 6032 and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6032 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6032-2Z (shields) and 6032-2RSH (contact seals), not suffix-free 6032.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032 bearing?", "a": "A 6032 deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6032 need?", "a": "The open 6032 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6032 mean?", "a": "A bare 6032 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6032?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032 — the open (unsealed) execution, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 3600 r/min, mass 5200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032." } ], "cross_ref": [ { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6032 M (machined brass cage, open arrangement) is the same-size execution on the 160×240×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6032-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 5300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6032-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 160 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6232 before committing to the smaller envelope.", "Contact seals add drag and heat: 6032-2RS runs slower and cooler-limited than the open 6032; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6032-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6032-2RS.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6032-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6032-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6032-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6032-RS1 exists for arrangements that lubricate through the open side; fitting 6032-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032-2RS bearing?", "a": "A 6032-2RS deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6032-2RS need?", "a": "6032-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6032 with a housing grease fitting instead." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6032-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6032-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032-2RS1 — two contact elastomer seals over a lifetime grease fill, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 1600 r/min, mass 5300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032-2RS." } ], "cross_ref": [ { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6032 M (machined brass cage, open arrangement) is the same-size execution on the 160×240×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6032-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6032-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 5400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6032-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6032-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 160 mm of 6032-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6032-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6032-2RS for that.", "Do not wash 6032-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 6032-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6032-2Z (one shield: 6032-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6032-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6032-2Z for high-contamination positions.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032-ZZ bearing?", "a": "A 6032-ZZ deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6032 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6032 uses the same ISO 15 envelope (160×240×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6032-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6032-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6032 and verify the residual clearance after mounting." }, { "q": "How should 6032-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6032-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032-2Z — two non-contact sheet-metal shields, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 2800 r/min, mass 5400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032-ZZ." } ], "cross_ref": [ { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6032 M (machined brass cage, open arrangement) is the same-size execution on the 160×240×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6032-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6034", "brand": "SKF", "manufacturer_designation": "SKF 6034", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 168, "static_load_kN": 173, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 7000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6034 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 260 mm outside diameter and 42 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 170 mm bore the ring mass is significant: heat 6034 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 170 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6234 before committing to the smaller envelope.", "The open 6034 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6034 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 170 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6034.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 42 mm-wide ring of 6034 drags the lip and overheats it.", "The open 6034 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6034-2Z (shields) and 6034-2RSH (contact seals), not suffix-free 6034.", "The 168/173 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6034 bearing?", "a": "A 6034 deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6034 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 170 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6034 need?", "a": "The open 6034 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6034 bore code work?", "a": "The last two digits of 6034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6034?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6034 — the open (unsealed) execution, 170×260×42 mm per ISO 15. Quoted values: C 168 kN, C0 173 kN, Pu 5 kN, limiting speed 3200 r/min, mass 7000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6034." } ], "cross_ref": [ { "equiv_sku": "6034-2RS", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6034-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6034-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6034-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6034-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6034-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6034-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6034-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6034 M (machined brass cage, open arrangement) is the same-size execution on the 170×260×42 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6036", "brand": "SKF", "manufacturer_designation": "SKF 6036", "series": "6000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 190, "static_load_kN": 200, "fatigue_load_limit_kN": 5.6, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 9100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 180 mm bore the ring mass is significant: heat 6036 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 180 mm bore uses a smaller 280 mm OD than a 6236; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6036 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6036 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 180 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6036 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6036-2Z (shields) and 6036-2RSH (contact seals), not suffix-free 6036.", "The 190/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6036 bearing?", "a": "A 6036 deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6036 have?", "a": "Unless a clearance suffix says otherwise, 6036 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6036 and verify the residual clearance after mounting." }, { "q": "How should 6036 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6036 need?", "a": "The open 6036 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6036?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6036 — the open (unsealed) execution, 180×280×46 mm per ISO 15. Quoted values: C 190 kN, C0 200 kN, Pu 5.6 kN, limiting speed 3000 r/min, mass 9100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6036." } ], "cross_ref": [ { "equiv_sku": "6036-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6036-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6036-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6036-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6036", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6036-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6036 M (machined brass cage, open arrangement) is the same-size execution on the 180×280×46 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6038", "brand": "SKF", "manufacturer_designation": "SKF 6038", "series": "6000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 195, "static_load_kN": 216, "fatigue_load_limit_kN": 5.85, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 9550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6038 carries bore code 38 = 190 mm. Outside diameter 290 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 190 mm bore the ring mass is significant: heat 6038 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 190 mm bore uses a smaller 290 mm OD than a 6238; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6038 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6038 units.", "Measure the shaft, do not trust the drawing: a 190 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6038.", "Vibration during standstill brinells the raceways of a 190 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6038 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6038-2Z (shields) and 6038-2RSH (contact seals), not suffix-free 6038.", "The 195/216 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6038 bearing?", "a": "A 6038 deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 46 mm width (7.48 × 11.417 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6038 have?", "a": "Unless a clearance suffix says otherwise, 6038 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6038 and verify the residual clearance after mounting." }, { "q": "How should 6038 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 190 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6038 need?", "a": "The open 6038 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6038?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6038 — the open (unsealed) execution, 190×290×46 mm per ISO 15. Quoted values: C 195 kN, C0 216 kN, Pu 5.85 kN, limiting speed 3000 r/min, mass 9550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6038." } ], "cross_ref": [ { "equiv_sku": "6038-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6038-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6038-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6038", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6038-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6038 M (machined brass cage, open arrangement) is the same-size execution on the 190×290×46 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6044", "brand": "SKF", "manufacturer_designation": "SKF 6044", "series": "6000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 247, "static_load_kN": 290, "fatigue_load_limit_kN": 7.35, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 220 mm of 6044 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 220 mm bore uses a smaller 340 mm OD than a 6244; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6044 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6044 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 220 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6044 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6044-2Z (shields) and 6044-2RSH (contact seals), not suffix-free 6044.", "The 247/290 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6044 bearing?", "a": "A 6044 deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 56 mm width (8.661 × 13.386 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6044 mean?", "a": "A bare 6044 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 220 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (340×56 mm, 60.0 mm radial section) at 220 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6044 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6044 uses the same ISO 15 envelope (220×340×56 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6044?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6044 — the open (unsealed) execution, 220×340×56 mm per ISO 15. Quoted values: C 247 kN, C0 290 kN, Pu 7.35 kN, limiting speed 2400 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6044." } ], "cross_ref": [ { "equiv_sku": "6044-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6044-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×340×56 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6044-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6044", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6044-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6044 M (machined brass cage, open arrangement) is the same-size execution on the 220×340×56 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6048", "brand": "SKF", "manufacturer_designation": "SKF 6048", "series": "6000-series", "type": "deep_groove", "d_mm": 240, "D_mm": 360, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 255, "static_load_kN": 315, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 17000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6048 carries bore code 48 = 240 mm. Outside diameter 360 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 240 mm of 6048 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 240 mm bore uses a smaller 360 mm OD than a 6248; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6048 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6048 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6048-C3. No clearance suffix means normal CN clearance.", "A 240 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6048 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6048-2Z (shields) and 6048-2RSH (contact seals), not suffix-free 6048.", "The 255/315 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6048 bearing?", "a": "A 6048 deep-groove ball bearing has a 240 mm bore, 360 mm outer diameter and 56 mm width (9.449 × 14.173 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 240 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (360×56 mm, 60.0 mm radial section) at 240 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6048 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6048 uses the same ISO 15 envelope (240×360×56 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6048 have?", "a": "Unless a clearance suffix says otherwise, 6048 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6048 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6048?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6048 — the open (unsealed) execution, 240×360×56 mm per ISO 15. Quoted values: C 255 kN, C0 315 kN, Pu 7.8 kN, limiting speed 2200 r/min, mass 17000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6048." } ], "cross_ref": [ { "equiv_sku": "6048-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6048-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6048", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6048-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6048 M (machined brass cage, open arrangement) is the same-size execution on the 240×360×56 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6052", "brand": "SKF", "manufacturer_designation": "SKF 6052", "series": "6000-series", "type": "deep_groove", "d_mm": 260, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 291, "static_load_kN": 375, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 25000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6052 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 52 by five gives the 260 mm bore; the 400 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 260 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 260 mm bore the ring mass is significant: heat 6052 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 260 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6252 before committing to the smaller envelope.", "The open 6052 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×400×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6052 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 65 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 400 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6052.", "The open 6052 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6052-2Z (shields) and 6052-2RSH (contact seals), not suffix-free 6052.", "The 291/375 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6052 bearing?", "a": "A 6052 deep-groove ball bearing has a 260 mm bore, 400 mm outer diameter and 65 mm width (10.236 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6052 mean?", "a": "A bare 6052 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 260 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (400×65 mm, 70.0 mm radial section) at 260 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6052 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6052 uses the same ISO 15 envelope (260×400×65 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6052?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6052 — the open (unsealed) execution, 260×400×65 mm per ISO 15. Quoted values: C 291 kN, C0 375 kN, Pu 8.8 kN, limiting speed 2000 r/min, mass 25000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6052." } ], "cross_ref": [ { "equiv_sku": "6052-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 260×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6052", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6052-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6052 M (machined brass cage, open arrangement) is the same-size execution on the 260×400×65 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6056", "brand": "SKF", "manufacturer_designation": "SKF 6056", "series": "6000-series", "type": "deep_groove", "d_mm": 280, "D_mm": 420, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 302, "static_load_kN": 405, "fatigue_load_limit_kN": 9.3, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 26000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6056 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 56 by five gives the 280 mm bore; the 420 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 280 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 280 mm of 6056 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 280 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6256 before committing to the smaller envelope.", "Storage matters for open bearings: 6056 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6056 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 65 mm-wide ring of 6056 drags the lip and overheats it.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 420 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6056.", "The open 6056 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6056-2Z (shields) and 6056-2RSH (contact seals), not suffix-free 6056.", "The 302/405 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6056 bearing?", "a": "A 6056 deep-groove ball bearing has a 280 mm bore, 420 mm outer diameter and 65 mm width (11.024 × 16.535 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6056 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 280 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6056 need?", "a": "The open 6056 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6056 bore code work?", "a": "The last two digits of 6056 are bore code 56, giving 56 × 5 = 280 mm bore. The 420 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6056?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6056 — the open (unsealed) execution, 280×420×65 mm per ISO 15. Quoted values: C 302 kN, C0 405 kN, Pu 9.3 kN, limiting speed 1900 r/min, mass 26000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6056." } ], "cross_ref": [ { "equiv_sku": "6056-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 280×420×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6056", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6056-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6056 M (machined brass cage, open arrangement) is the same-size execution on the 280×420×65 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800", "brand": "SKF", "manufacturer_designation": "SKF 61800", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 80000, "limiting_speed_rpm": 48000, "max_rpm": 48000, "weight_g": 5, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Miniature bearings like 61800 (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 10 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6200.", "The open 61800 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×19×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61800 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61800 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61800.", "The open 61800 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61800-2Z (shields) and 61800-2RSH (contact seals), not suffix-free 61800.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800 bearing?", "a": "A 61800 deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61800 mean?", "a": "A bare 61800 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61800 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61800 uses the same ISO 15 envelope (10×19×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61800?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800 — the open (unsealed) execution, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 48000 r/min, mass 5 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800." } ], "cross_ref": [ { "equiv_sku": "61800-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61800-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2RS1 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2Z shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61800-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61800-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Codes 00–03 are the exception series: 61800 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 10 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6200.", "Contact seals add drag and heat: 61800-2RS runs slower and cooler-limited than the open 61800; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61800-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 19 mm OD should be round within IT7; an oval bore pinches the outer ring of 61800-2RS and shows up later as two-point loaded raceway wear.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61800-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 22000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 80000 r/min thermal reference speed.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800-2RS bearing?", "a": "A 61800-2RS deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61800 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61800 uses the same ISO 15 envelope (10×19×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61800-2RS have?", "a": "Unless a clearance suffix says otherwise, 61800-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61800 and verify the residual clearance after mounting." }, { "q": "How should 61800-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61800-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800-2RS1 — two contact elastomer seals over a lifetime grease fill, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 22000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800-2RS." } ], "cross_ref": [ { "equiv_sku": "61800-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61800-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2RS1 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2Z shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61800-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61800-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 80000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61800-2Z.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61800 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6200.", "Do not wash 61800-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61800-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 61800-2Z (one shield: 61800-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800-ZZ bearing?", "a": "A 61800-ZZ deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61800 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61800 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61800-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61800-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800-2Z — two non-contact sheet-metal shields, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 38000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800-ZZ." } ], "cross_ref": [ { "equiv_sku": "61800-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61800-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61800-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2RS1 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2Z shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61800-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801", "brand": "SKF", "manufacturer_designation": "SKF 61801", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "reference_speed_rpm": 70000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61801 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 21 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Codes 00–03 are the exception series: 61801 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "Storage matters for open bearings: 61801 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61801 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 21 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61801.", "The open 61801 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61801-2Z (shields) and 61801-2RSH (contact seals), not suffix-free 61801.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801 bearing?", "a": "A 61801 deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61801 need?", "a": "The open 61801 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61801 mean?", "a": "A bare 61801 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61801?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801 — the open (unsealed) execution, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 43000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801." } ], "cross_ref": [ { "equiv_sku": "61801-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2RS1 shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2Z shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61801-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61801 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61801-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Codes 00–03 are the exception series: 61801 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "Contact seals add drag and heat: 61801-2RS runs slower and cooler-limited than the open 61801; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61801-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61801-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61801-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 20000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 70000 r/min thermal reference speed.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801-2RS bearing?", "a": "A 61801-2RS deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61801-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61801-2RS need?", "a": "61801-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61801 with a housing grease fitting instead." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 61801-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801-2RS1 — two contact elastomer seals over a lifetime grease fill, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 20000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801-2RS." } ], "cross_ref": [ { "equiv_sku": "61801-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2RS1 shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2Z shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61801-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61801-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61801-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 21 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61801-2Z.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Codes 00–03 are the exception series: 61801 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 12 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6201.", "ZZ shields are non-contact: 61801-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61801-2RS for that.", "Shielded 61801-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 5 mm-wide ring of 61801-ZZ drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 61801-2Z (one shield: 61801-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801-ZZ bearing?", "a": "A 61801-ZZ deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61801-ZZ have?", "a": "Unless a clearance suffix says otherwise, 61801-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61801 and verify the residual clearance after mounting." }, { "q": "How should 61801-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61801-ZZ need?", "a": "61801-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 61801-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801-2Z — two non-contact sheet-metal shields, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 36000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801-ZZ." } ], "cross_ref": [ { "equiv_sku": "61801-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2RS1 shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2Z shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61801-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802", "brand": "SKF", "manufacturer_designation": "SKF 61802", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "reference_speed_rpm": 60000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61802 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 24 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Codes 00–03 are the exception series: 61802 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 15 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6202.", "The open 61802 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×24×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61802 units.", "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61802.", "The open 61802 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61802-2Z (shields) and 61802-2RSH (contact seals), not suffix-free 61802.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802 bearing?", "a": "A 61802 deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61802 mean?", "a": "A bare 61802 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 15 mm bore?", "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6202, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61802 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61802 uses the same ISO 15 envelope (15×24×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61802?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802 — the open (unsealed) execution, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 38000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802." } ], "cross_ref": [ { "equiv_sku": "61802-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2RS1 shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2Z shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61802-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61802-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61802 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "Contact seals add drag and heat: 61802-2RS runs slower and cooler-limited than the open 61802; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61802-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 61802-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 24 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61802-2RS.", "SKF catalogues the contact-sealed version as 61802-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 60000 r/min thermal reference speed.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802-2RS bearing?", "a": "A 61802-2RS deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61802 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61802 uses the same ISO 15 envelope (15×24×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61802-2RS have?", "a": "Unless a clearance suffix says otherwise, 61802-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61802 and verify the residual clearance after mounting." }, { "q": "How should 61802-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61802-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802-2RS1 — two contact elastomer seals over a lifetime grease fill, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 17000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802-2RS." } ], "cross_ref": [ { "equiv_sku": "61802-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2RS1 shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2Z shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61802-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61802-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61802-2Z.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Miniature bearings like 61802-ZZ (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "Do not wash 61802-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61802-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 61802-2Z (one shield: 61802-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802-ZZ bearing?", "a": "A 61802-ZZ deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 61802-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61802-ZZ need?", "a": "61802-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 61802 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61802 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 61802-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802-2Z — two non-contact sheet-metal shields, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 30000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802-ZZ." } ], "cross_ref": [ { "equiv_sku": "61802-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2RS1 shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2Z shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61802-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803", "brand": "SKF", "manufacturer_designation": "SKF 61803", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61803 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 26 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Miniature bearings like 61803 (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "The open 61803 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×26×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61803 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 61803 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61803 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61803-2Z (shields) and 61803-2RSH (contact seals), not suffix-free 61803.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803 bearing?", "a": "A 61803 deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61803 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61803 need?", "a": "The open 61803 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "Why does 61803 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61803 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 61803?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803 — the open (unsealed) execution, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 34000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803." } ], "cross_ref": [ { "equiv_sku": "61803-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2RS1 shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2Z shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61803-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61803-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 26 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61803-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61803 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "Heat is the enemy of the sealed 61803-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61803-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61803-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 16000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-2RS bearing?", "a": "A 61803-2RS deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61803 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61803 uses the same ISO 15 envelope (17×26×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61803-2RS have?", "a": "Unless a clearance suffix says otherwise, 61803-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61803 and verify the residual clearance after mounting." }, { "q": "How should 61803-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61803-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2RS1 — two contact elastomer seals over a lifetime grease fill, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 16000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-2RS." } ], "cross_ref": [ { "equiv_sku": "61803-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2RS1 shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2Z shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61803-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61803-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Codes 00–03 are the exception series: 61803 takes its 17 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "The low-drag lip of 61803-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61803-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61803-RSR.", "SKF catalogues the low-friction seal as 61803-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-RSR bearing?", "a": "A 61803-RSR deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61803-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 17 mm bore?", "a": "618 is an extra-thin section: 26×5 mm, only 4.5 mm radial section at 17 mm bore, far smaller than a 6203, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61803 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61803 uses the same ISO 15 envelope (17×26×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61803-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2RZ — two low-friction non-contact elastomer seals, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 28000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-RSR." } ], "cross_ref": [ { "equiv_sku": "61803-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2RS1 shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2Z shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61803-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61803-2Z.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Miniature bearings like 61803-ZZ (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "Do not wash 61803-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61803-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 5 mm-wide ring of 61803-ZZ drags the lip and overheats it.", "SKF spells the shielded version 61803-2Z (one shield: 61803-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-ZZ bearing?", "a": "A 61803-ZZ deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61803-ZZ have?", "a": "Unless a clearance suffix says otherwise, 61803-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61803 and verify the residual clearance after mounting." }, { "q": "How should 61803-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61803-ZZ need?", "a": "61803-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 61803-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2Z — two non-contact sheet-metal shields, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 28000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-ZZ." } ], "cross_ref": [ { "equiv_sku": "61803-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2RS1 shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2Z shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61804-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61804-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "A 20 mm shaft for 61804 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 20 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6204.", "RSR low-friction seals on 61804-RSR run faster than contact-seal 61804-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61804-2RS instead.", "The non-contact lip of 61804-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61804-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61804-RSR.", "SKF catalogues the low-friction seal as 61804-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804-RSR bearing?", "a": "A 61804-RSR deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61804 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61804 uses the same ISO 15 envelope (20×32×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61804-RSR have?", "a": "Unless a clearance suffix says otherwise, 61804-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61804 and verify the residual clearance after mounting." }, { "q": "How should 61804-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61804-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804-2RZ — two low-friction non-contact elastomer seals, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 22000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61804-RSR." } ], "cross_ref": [ { "equiv_sku": "61804-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61804-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2RS1 shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61804-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2Z shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61804-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805", "brand": "SKF", "manufacturer_designation": "SKF 61805", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61805 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 37 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 25 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6205.", "Storage matters for open bearings: 61805 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61805 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61805 drags the lip and overheats it.", "The open 61805 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61805-2Z (shields) and 61805-2RSH (contact seals), not suffix-free 61805.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805 bearing?", "a": "A 61805 deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61805 have?", "a": "Unless a clearance suffix says otherwise, 61805 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61805 and verify the residual clearance after mounting." }, { "q": "How should 61805 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61805 need?", "a": "The open 61805 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61805?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805 — the open (unsealed) execution, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 24000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805." } ], "cross_ref": [ { "equiv_sku": "61805-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61805-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2RS1 shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61805-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2Z shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61805-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61805-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61805-2RS.", "The 618xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6205.", "Contact seals add drag and heat: 61805-2RS runs slower and cooler-limited than the open 61805; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61805-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 61805-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61805-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 11000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805-2RS bearing?", "a": "A 61805-2RS deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61805 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61805 uses the same ISO 15 envelope (25×37×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61805-2RS have?", "a": "Unless a clearance suffix says otherwise, 61805-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61805 and verify the residual clearance after mounting." }, { "q": "How should 61805-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61805-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805-2RS1 — two contact elastomer seals over a lifetime grease fill, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 11000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805-2RS." } ], "cross_ref": [ { "equiv_sku": "61805-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61805-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2RS1 shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61805-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2Z shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61805-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61805-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61805-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 37 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61805-2RZ.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 25 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6205.", "The low-drag lip of 61805-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61805-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61805-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805-RSR bearing?", "a": "A 61805-RSR deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61805-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 25 mm bore?", "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61805 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61805 uses the same ISO 15 envelope (25×37×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61805-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805-2RZ — two low-friction non-contact elastomer seals, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 19000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805-RSR." } ], "cross_ref": [ { "equiv_sku": "61805-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61805-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2RS1 shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61805-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2Z shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61805-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806", "brand": "SKF", "manufacturer_designation": "SKF 61806", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "A 30 mm shaft for 61806 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "The open 61806 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×42×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61806 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61806 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61806-2Z (shields) and 61806-2RSH (contact seals), not suffix-free 61806.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806 bearing?", "a": "A 61806 deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61806 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61806 need?", "a": "The open 61806 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61806?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806 — the open (unsealed) execution, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 20000 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806." } ], "cross_ref": [ { "equiv_sku": "61806-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61806-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61806-2RS1 shares the 30×42×7 mm envelope but rates differently (4.49/2.9 kN vs 3.58/2.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61806-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61806-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 42 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61806-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "Heat is the enemy of the sealed 61806-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61806-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61806-2RS.", "SKF catalogues the contact-sealed version as 61806-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806-2RS bearing?", "a": "A 61806-2RS deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61806-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61806-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 9500 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806-2RS." } ], "cross_ref": [ { "equiv_sku": "61806-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61806-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61806-2RS1 shares the 30×42×7 mm envelope but rates differently (4.49/2.9 kN vs 3.58/2.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61806-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61806-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61806-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 42 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61806-2RZ.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61806-RSR.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 30 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6206.", "The low-drag lip of 61806-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61806-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 61806-RSR and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61806-RSR.", "SKF catalogues the low-friction seal as 61806-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 16000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806-RSR bearing?", "a": "A 61806-RSR deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61806 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61806 uses the same ISO 15 envelope (30×42×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61806-RSR have?", "a": "Unless a clearance suffix says otherwise, 61806-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61806 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61806-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806-2RZ — two low-friction non-contact elastomer seals, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 16000 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806-RSR." } ], "cross_ref": [ { "equiv_sku": "61806-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61806-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61806-2RS1 shares the 30×42×7 mm envelope but rates differently (4.49/2.9 kN vs 3.58/2.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61806-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807", "brand": "SKF", "manufacturer_designation": "SKF 61807", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "reference_speed_rpm": 30000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 29, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61807 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 47 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 35 mm shaft for 61807 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.", "The open 61807 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×47×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61807 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 47 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61807.", "The open 61807 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61807-2Z (shields) and 61807-2RSH (contact seals), not suffix-free 61807.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807 bearing?", "a": "A 61807 deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61807 mean?", "a": "A bare 61807 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61807 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61807 uses the same ISO 15 envelope (35×47×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61807?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807 — the open (unsealed) execution, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 18000 r/min, mass 29 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807." } ], "cross_ref": [ { "equiv_sku": "61807-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61807-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61807-2RS1 shares the 35×47×7 mm envelope but rates differently (4.36/3.35 kN vs 3.71/3.35 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61807-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61807-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 47 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61807-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61807-2RS.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 35 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6207.", "Contact seals add drag and heat: 61807-2RS runs slower and cooler-limited than the open 61807; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61807-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61807-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61807-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807-2RS bearing?", "a": "A 61807-2RS deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61807 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61807 uses the same ISO 15 envelope (35×47×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61807-2RS have?", "a": "Unless a clearance suffix says otherwise, 61807-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61807 and verify the residual clearance after mounting." }, { "q": "How should 61807-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61807-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 8500 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807-2RS." } ], "cross_ref": [ { "equiv_sku": "61807-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61807-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61807-2RS1 shares the 35×47×7 mm envelope but rates differently (4.36/3.35 kN vs 3.71/3.35 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61807-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61807-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61807-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 47 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61807-2RZ.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "A 35 mm shaft for 61807 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 35 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6207.", "The low-drag lip of 61807-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61807-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61807-RSR.", "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61807-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807-RSR bearing?", "a": "A 61807-RSR deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61807-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61807 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61807 uses the same ISO 15 envelope (35×47×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61807-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807-2RZ — two low-friction non-contact elastomer seals, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 15000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807-RSR." } ], "cross_ref": [ { "equiv_sku": "61807-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61807-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61807-2RS1 shares the 35×47×7 mm envelope but rates differently (4.36/3.35 kN vs 3.71/3.35 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61807-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808", "brand": "SKF", "manufacturer_designation": "SKF 61808", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 26000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61808.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.", "Storage matters for open bearings: 61808 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61808 units.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61808 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61808-2Z (shields) and 61808-2RSH (contact seals), not suffix-free 61808.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808 bearing?", "a": "A 61808 deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61808 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61808 uses the same ISO 15 envelope (40×52×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61808 have?", "a": "Unless a clearance suffix says otherwise, 61808 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61808 and verify the residual clearance after mounting." }, { "q": "How should 61808 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61808?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808 — the open (unsealed) execution, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 16000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808." } ], "cross_ref": [ { "equiv_sku": "61808-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61808-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61808-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 52 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61808-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "A 40 mm shaft for 61808 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.", "Contact seals add drag and heat: 61808-2RS runs slower and cooler-limited than the open 61808; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61808-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61808-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61808-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 26000 r/min thermal reference speed.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808-2RS bearing?", "a": "A 61808-2RS deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61808-2RS need?", "a": "61808-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61808 with a housing grease fitting instead." }, { "q": "How does the 61808 bore code work?", "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61808-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61808-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 7500 r/min, mass 34 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808-2RS." } ], "cross_ref": [ { "equiv_sku": "61808-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61808-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61808-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 26000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61808-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.", "The low-drag lip of 61808-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61808-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61808-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61808-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 26000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808-RSR bearing?", "a": "A 61808-RSR deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 40 mm bore?", "a": "618 is an extra-thin section: 52×7 mm, only 6.0 mm radial section at 40 mm bore, far smaller than a 6208, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61808 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61808 uses the same ISO 15 envelope (40×52×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61808-RSR have?", "a": "Unless a clearance suffix says otherwise, 61808-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61808 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61808-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808-2RZ — two low-friction non-contact elastomer seals, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 13000 r/min, mass 34 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808-RSR." } ], "cross_ref": [ { "equiv_sku": "61808-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61808-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809", "brand": "SKF", "manufacturer_designation": "SKF 61809", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61809.", "Only 6.5 mm of radial section separates bore and OD on the 618xx series at 45 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6209.", "Storage matters for open bearings: 61809 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61809 units.", "The housing bore for the 58 mm OD should be round within IT7; an oval bore pinches the outer ring of 61809 and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61809 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61809-2Z (shields) and 61809-2RSH (contact seals), not suffix-free 61809.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809 bearing?", "a": "A 61809 deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61809 mean?", "a": "A bare 61809 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61809?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809 — the open (unsealed) execution, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 14000 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809." } ], "cross_ref": [ { "equiv_sku": "61809-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61809-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61809-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61809-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61809-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61809-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61809-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 58 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61809-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "A 45 mm shaft for 61809 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "Heat is the enemy of the sealed 61809-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61809-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61809-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61809-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 22000 r/min thermal reference speed.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809-2RS bearing?", "a": "A 61809-2RS deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61809 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61809 uses the same ISO 15 envelope (45×58×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61809-2RS have?", "a": "Unless a clearance suffix says otherwise, 61809-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61809 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61809-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 6700 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809-2RS." } ], "cross_ref": [ { "equiv_sku": "61809-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61809-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61809-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61809-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61809-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61809-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61809-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61809-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Only 6.5 mm of radial section separates bore and OD on the 618xx series at 45 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6209.", "The low-drag lip of 61809-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61809-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61809-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 58 mm OD should be round within IT7; an oval bore pinches the outer ring of 61809-RSR and shows up later as two-point loaded raceway wear.", "SKF catalogues the low-friction seal as 61809-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 22000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809-RSR bearing?", "a": "A 61809-RSR deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 61809-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61809-RSR need?", "a": "61809-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61809 with a housing grease fitting instead." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61809-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809-2RZ — two low-friction non-contact elastomer seals, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 11000 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809-RSR." } ], "cross_ref": [ { "equiv_sku": "61809-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61809-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61809-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61809-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61809-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61809-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810", "brand": "SKF", "manufacturer_designation": "SKF 61810", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61810 with C3 clearance and re-check the residual value after mounting.", "Only 7.5 mm of radial section separates bore and OD on the 618xx series at 50 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6210.", "The open 61810 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×65×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61810 units.", "Never mix components between two 61810 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61810.", "The open 61810 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61810-2Z (shields) and 61810-2RSH (contact seals), not suffix-free 61810.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810 bearing?", "a": "A 61810 deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61810 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61810 uses the same ISO 15 envelope (50×65×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61810 have?", "a": "Unless a clearance suffix says otherwise, 61810 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61810 and verify the residual clearance after mounting." }, { "q": "How should 61810 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61810?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810 — the open (unsealed) execution, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 13000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810." } ], "cross_ref": [ { "equiv_sku": "61810-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61810-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61810-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61810-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61810-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61810-2RS1 shares the 50×65×7 mm envelope but rates differently (6.76/6.8 kN vs 5.07/5.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61810-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61810-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 65 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61810-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61810 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "Contact seals add drag and heat: 61810-2RS runs slower and cooler-limited than the open 61810; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61810-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61810-2RS drags the lip and overheats it.", "The housing bore for the 65 mm OD should be round within IT7; an oval bore pinches the outer ring of 61810-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 61810-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810-2RS bearing?", "a": "A 61810-2RS deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61810-2RS have?", "a": "Unless a clearance suffix says otherwise, 61810-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61810 and verify the residual clearance after mounting." }, { "q": "How should 61810-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61810-2RS need?", "a": "61810-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61810 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61810-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 6000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810-2RS." } ], "cross_ref": [ { "equiv_sku": "61810-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61810-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61810-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61810-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61810-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61810-2RS1 shares the 50×65×7 mm envelope but rates differently (6.76/6.8 kN vs 5.07/5.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61810-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61810-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61810-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61810 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "RSR low-friction seals on 61810-RSR run faster than contact-seal 61810-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61810-2RS instead.", "The low-drag lip of 61810-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61810-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 10000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810-RSR bearing?", "a": "A 61810-RSR deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 61810-RSR need?", "a": "61810-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61810 with a housing grease fitting instead." }, { "q": "How does the 61810 bore code work?", "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61810-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 61810-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810-2RZ — two low-friction non-contact elastomer seals, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 10000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810-RSR." } ], "cross_ref": [ { "equiv_sku": "61810-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61810-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61810-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61810-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61810-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61810-2RS1 shares the 50×65×7 mm envelope but rates differently (6.76/6.8 kN vs 5.07/5.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61810-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811", "brand": "SKF", "manufacturer_designation": "SKF 61811", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61811 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 72 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61811 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "The open 61811 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×72×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61811 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 61811 and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61811-C3. No clearance suffix means normal CN clearance.", "The open 61811 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61811-2Z (shields) and 61811-2RSH (contact seals), not suffix-free 61811.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811 bearing?", "a": "A 61811 deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61811 have?", "a": "Unless a clearance suffix says otherwise, 61811 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61811 and verify the residual clearance after mounting." }, { "q": "How should 61811 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61811 need?", "a": "The open 61811 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61811?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811 — the open (unsealed) execution, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 12000 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811." } ], "cross_ref": [ { "equiv_sku": "61811-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61811-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61811-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61811-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61811-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61811-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61811-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61811 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "Contact seals add drag and heat: 61811-2RS runs slower and cooler-limited than the open 61811; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61811-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61811-2RS.", "SKF catalogues the contact-sealed version as 61811-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811-2RS bearing?", "a": "A 61811-2RS deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61800 compare with other series at the same 55 mm bore?", "a": "618 is an extra-thin section: 72×9 mm, only 8.5 mm radial section at 55 mm bore, far smaller than a 6211, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61811 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61811 uses the same ISO 15 envelope (55×72×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61811-2RS have?", "a": "Unless a clearance suffix says otherwise, 61811-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61811 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61811-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 5300 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811-2RS." } ], "cross_ref": [ { "equiv_sku": "61811-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61811-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61811-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61811-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61811-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61811-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61811-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61811-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 72 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61811-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61811 with C3 for those conditions.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "RSR low-friction seals on 61811-RSR run faster than contact-seal 61811-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61811-2RS instead.", "The non-contact lip of 61811-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61811-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61811-RSR.", "SKF catalogues the low-friction seal as 61811-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9500 r/min limiting speed, closer to the open bearing's 19000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811-RSR bearing?", "a": "A 61811-RSR deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61811-RSR have?", "a": "Unless a clearance suffix says otherwise, 61811-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61811 and verify the residual clearance after mounting." }, { "q": "How should 61811-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61811-RSR need?", "a": "61811-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61811 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61811-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811-2RZ — two low-friction non-contact elastomer seals, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 9500 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811-RSR." } ], "cross_ref": [ { "equiv_sku": "61811-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61811-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61811-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61811-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61811-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61811-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61811-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812", "brand": "SKF", "manufacturer_designation": "SKF 61812", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61812 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 78 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61812 against the shaft shoulder while it cools so the ring cannot creep back.", "Only 9.0 mm of radial section separates bore and OD on the 618xx series at 60 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.", "The open 61812 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×78×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61812 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 78 mm OD should be round within IT7; an oval bore pinches the outer ring of 61812 and shows up later as two-point loaded raceway wear.", "The open 61812 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61812-2Z (shields) and 61812-2RSH (contact seals), not suffix-free 61812.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812 bearing?", "a": "A 61812 deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61812 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61812 need?", "a": "The open 61812 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61812?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812 — the open (unsealed) execution, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812." } ], "cross_ref": [ { "equiv_sku": "61812-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61812-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61812-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61812-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61812-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61812-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61812-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 78 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61812-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61812 with C3 clearance and re-check the residual value after mounting.", "Only 9.0 mm of radial section separates bore and OD on the 618xx series at 60 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.", "Contact seals add drag and heat: 61812-2RS runs slower and cooler-limited than the open 61812; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61812-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 61812-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812-2RS bearing?", "a": "A 61812-2RS deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61812-2RS need?", "a": "61812-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61812 with a housing grease fitting instead." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61812-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61812-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 4800 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812-2RS." } ], "cross_ref": [ { "equiv_sku": "61812-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61812-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61812-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61812-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61812-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61812-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61812-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61812-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.", "Only 9.0 mm of radial section separates bore and OD on the 618xx series at 60 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.", "RSR low-friction seals on 61812-RSR run faster than contact-seal 61812-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61812-2RS instead.", "The non-contact lip of 61812-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 60 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61812-RSR.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61812-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61812-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812-RSR bearing?", "a": "A 61812-RSR deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 60 mm bore?", "a": "618 is an extra-thin section: 78×10 mm, only 9.0 mm radial section at 60 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61812 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61812 uses the same ISO 15 envelope (60×78×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61812-RSR have?", "a": "Unless a clearance suffix says otherwise, 61812-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61812 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61812-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812-2RZ — two low-friction non-contact elastomer seals, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 8500 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812-RSR." } ], "cross_ref": [ { "equiv_sku": "61812-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61812-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61812-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61812-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61812-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61812-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61812-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813", "brand": "SKF", "manufacturer_designation": "SKF 61813", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "The open 61813 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×85×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61813 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61813 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61813-2Z (shields) and 61813-2RSH (contact seals), not suffix-free 61813.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813 bearing?", "a": "A 61813 deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61813 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61813 uses the same ISO 15 envelope (65×85×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61813 have?", "a": "Unless a clearance suffix says otherwise, 61813 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61813 and verify the residual clearance after mounting." }, { "q": "How should 61813 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61813?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813 — the open (unsealed) execution, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 10000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813." } ], "cross_ref": [ { "equiv_sku": "61813-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61813-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61813-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61813-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61813-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61813-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61813-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "Contact seals add drag and heat: 61813-2RS runs slower and cooler-limited than the open 61813; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61813-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61813-2RS drags the lip and overheats it.", "Never mix components between two 61813-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the contact-sealed version as 61813-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813-2RS bearing?", "a": "A 61813-2RS deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61813 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61813 uses the same ISO 15 envelope (65×85×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61813-2RS have?", "a": "Unless a clearance suffix says otherwise, 61813-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61813 and verify the residual clearance after mounting." }, { "q": "How should 61813-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61813-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 4500 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813-2RS." } ], "cross_ref": [ { "equiv_sku": "61813-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61813-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61813-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61813-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61813-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61813-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61813-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61813-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 85 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61813-2RZ.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61813 with C3 clearance and re-check the residual value after mounting.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 65 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6213.", "The low-drag lip of 61813-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61813-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61813-RSR drags the lip and overheats it.", "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 61813-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8000 r/min limiting speed, closer to the open bearing's 16000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813-RSR bearing?", "a": "A 61813-RSR deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61813-RSR have?", "a": "Unless a clearance suffix says otherwise, 61813-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61813 and verify the residual clearance after mounting." }, { "q": "How should 61813-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61813-RSR need?", "a": "61813-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61813 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61813-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813-2RZ — two low-friction non-contact elastomer seals, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 8000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813-RSR." } ], "cross_ref": [ { "equiv_sku": "61813-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61813-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61813-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61813-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61813-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61813-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814", "brand": "SKF", "manufacturer_designation": "SKF 61814", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61814 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 90 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61814 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "Storage matters for open bearings: 61814 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61814 units.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 61814 and shows up later as two-point loaded raceway wear.", "Never mix components between two 61814 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61814 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61814-2Z (shields) and 61814-2RSH (contact seals), not suffix-free 61814.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814 bearing?", "a": "A 61814 deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61814 have?", "a": "Unless a clearance suffix says otherwise, 61814 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61814 and verify the residual clearance after mounting." }, { "q": "How should 61814 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61814 need?", "a": "The open 61814 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61814?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814 — the open (unsealed) execution, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 9000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61814-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61814-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61814-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61814-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 90 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61814-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61814 with C3 clearance and re-check the residual value after mounting.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 70 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6214.", "Contact seals add drag and heat: 61814-2RS runs slower and cooler-limited than the open 61814; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61814-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 61814-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 61814-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814-2RS bearing?", "a": "A 61814-2RS deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61814-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 70 mm bore?", "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61814 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61814 uses the same ISO 15 envelope (70×90×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61814-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 4300 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814-2RS." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61814-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61814-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61814-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61814-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61814-2RZ.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61814 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "RSR low-friction seals on 61814-RSR run faster than contact-seal 61814-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61814-2RS instead.", "The non-contact lip of 61814-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61814-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814-RSR bearing?", "a": "A 61814-RSR deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 61814-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61814-RSR need?", "a": "61814-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61814 with a housing grease fitting instead." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61814-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814-2RZ — two low-friction non-contact elastomer seals, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 7500 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814-RSR." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61814-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61814-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61814-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815", "brand": "SKF", "manufacturer_designation": "SKF 61815", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "reference_speed_rpm": 14000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61815 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "The open 61815 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×95×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61815 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61815 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61815 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61815-2Z (shields) and 61815-2RSH (contact seals), not suffix-free 61815.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815 bearing?", "a": "A 61815 deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61815 mean?", "a": "A bare 61815 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61815?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815 — the open (unsealed) execution, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 8500 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61815-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61815-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 95 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61815-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61815 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "Heat is the enemy of the sealed 61815-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61815-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61815-C3. No clearance suffix means normal CN clearance.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61815-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815-2RS bearing?", "a": "A 61815-2RS deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61815-2RS have?", "a": "Unless a clearance suffix says otherwise, 61815-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61815 and verify the residual clearance after mounting." }, { "q": "How should 61815-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61815-2RS need?", "a": "61815-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61815 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61815-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 4000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815-2RS." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61815-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61815-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 95 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61815-2RZ.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61815 with C3 clearance and re-check the residual value after mounting.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 75 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.", "RSR low-friction seals on 61815-RSR run faster than contact-seal 61815-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61815-2RS instead.", "The non-contact lip of 61815-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61815-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61815-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7000 r/min limiting speed, closer to the open bearing's 14000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815-RSR bearing?", "a": "A 61815-RSR deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61815 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61815 uses the same ISO 15 envelope (75×95×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61815-RSR have?", "a": "Unless a clearance suffix says otherwise, 61815-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61815 and verify the residual clearance after mounting." }, { "q": "How should 61815-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61815-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815-2RZ — two low-friction non-contact elastomer seals, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 7000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815-RSR." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61816", "brand": "SKF", "manufacturer_designation": "SKF 61816", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.61, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61816 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 100 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 61816 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "The open 61816 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×100×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61816 units.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61816 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61816-2Z (shields) and 61816-2RSH (contact seals), not suffix-free 61816.", "The 12.7/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61816 bearing?", "a": "A 61816 deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61816 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61816 need?", "a": "The open 61816 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61816?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61816 — the open (unsealed) execution, 80×100×10 mm per ISO 15. Quoted values: C 12.7 kN, C0 11.2 kN, Pu 0.61 kN, limiting speed 8000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61816." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61816-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61816-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61816-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.61, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61816-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "Heat is the enemy of the sealed 61816-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61816-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61816-2RS.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61816-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61816-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed.", "The 12.7/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61816-2RS bearing?", "a": "A 61816-2RS deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61816 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61816 uses the same ISO 15 envelope (80×100×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61816-2RS have?", "a": "Unless a clearance suffix says otherwise, 61816-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61816 and verify the residual clearance after mounting." }, { "q": "How should 61816-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61816-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61816-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×100×10 mm per ISO 15. Quoted values: C 12.7 kN, C0 11.2 kN, Pu 0.61 kN, limiting speed 3600 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61816-2RS." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61816-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61816-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817", "brand": "SKF", "manufacturer_designation": "SKF 61817", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 260, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 85 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.", "Storage matters for open bearings: 61817 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61817 units.", "Never mix components between two 61817 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61817 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61817-2Z (shields) and 61817-2RSH (contact seals), not suffix-free 61817.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817 bearing?", "a": "A 61817 deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61817 need?", "a": "The open 61817 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61817 mean?", "a": "A bare 61817 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61817?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817 — the open (unsealed) execution, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 7500 r/min, mass 260 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61817-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61817-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 110 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61817-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "Contact seals add drag and heat: 61817-2RS runs slower and cooler-limited than the open 61817; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61817-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61817-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817-2RS bearing?", "a": "A 61817-2RS deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61817-2RS need?", "a": "61817-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61817 with a housing grease fitting instead." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61817-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61817-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 3400 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817-2RS." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61817-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61817-2RZ.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 85 mm of 61817-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "The low-drag lip of 61817-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61817-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 110 mm OD should be round within IT7; an oval bore pinches the outer ring of 61817-RSR and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61817-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817-RSR bearing?", "a": "A 61817-RSR deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61817 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61817 uses the same ISO 15 envelope (85×110×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61817-RSR have?", "a": "Unless a clearance suffix says otherwise, 61817-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61817 and verify the residual clearance after mounting." }, { "q": "How should 61817-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61817-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817-2RZ — two low-friction non-contact elastomer seals, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 6000 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817-RSR." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818", "brand": "SKF", "manufacturer_designation": "SKF 61818", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 90 mm of 61818 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "The open 61818 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×115×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61818 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61818 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61818 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61818-2Z (shields) and 61818-2RSH (contact seals), not suffix-free 61818.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818 bearing?", "a": "A 61818 deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61818 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61818 uses the same ISO 15 envelope (90×115×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61818 have?", "a": "Unless a clearance suffix says otherwise, 61818 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61818 and verify the residual clearance after mounting." }, { "q": "How should 61818 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61818?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818 — the open (unsealed) execution, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 7000 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61818-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61818-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 61818 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "Contact seals add drag and heat: 61818-2RS runs slower and cooler-limited than the open 61818; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61818-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 115 mm OD should be round within IT7; an oval bore pinches the outer ring of 61818-2RS and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61818-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818-2RS bearing?", "a": "A 61818-2RS deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61818-2RS need?", "a": "61818-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61818 with a housing grease fitting instead." }, { "q": "How does the 61818 bore code work?", "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61818-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61818-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 3200 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818-2RS." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61818-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61818-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 61818 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 90 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6218.", "RSR low-friction seals on 61818-RSR run faster than contact-seal 61818-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61818-2RS instead.", "The non-contact lip of 61818-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61818-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61818-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5600 r/min limiting speed, closer to the open bearing's 11000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818-RSR bearing?", "a": "A 61818-RSR deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61818 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61818 uses the same ISO 15 envelope (90×115×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61818-RSR have?", "a": "Unless a clearance suffix says otherwise, 61818-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61818 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61818-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818-2RZ — two low-friction non-contact elastomer seals, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 5600 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818-RSR." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61819", "brand": "SKF", "manufacturer_designation": "SKF 61819", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.9, "static_load_kN": 17.6, "fatigue_load_limit_kN": 0.93, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61819 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 120 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.", "Storage matters for open bearings: 61819 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61819 units.", "The housing bore for the 120 mm OD should be round within IT7; an oval bore pinches the outer ring of 61819 and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61819-C3. No clearance suffix means normal CN clearance.", "The open 61819 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61819-2Z (shields) and 61819-2RSH (contact seals), not suffix-free 61819.", "The 19.9/17.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61819 bearing?", "a": "A 61819 deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61819 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61819 uses the same ISO 15 envelope (95×120×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61819 have?", "a": "Unless a clearance suffix says otherwise, 61819 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61819 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61819?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61819 — the open (unsealed) execution, 95×120×13 mm per ISO 15. Quoted values: C 19.9 kN, C0 17.6 kN, Pu 0.93 kN, limiting speed 6700 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61819." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61819-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61819-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61819-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.9, "static_load_kN": 17.6, "fatigue_load_limit_kN": 0.93, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 310, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61819-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 95 mm of 61819-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.", "Heat is the enemy of the sealed 61819-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61819-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61819-2RS.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 61819-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed.", "The 19.9/17.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61819-2RS bearing?", "a": "A 61819-2RS deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61819-2RS need?", "a": "61819-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61819 with a housing grease fitting instead." }, { "q": "How does the 61819 bore code work?", "a": "The last two digits of 61819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61819-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61819-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61819-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×120×13 mm per ISO 15. Quoted values: C 19.9 kN, C0 17.6 kN, Pu 0.93 kN, limiting speed 3000 r/min, mass 310 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61819-2RS." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61819-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61819-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820", "brand": "SKF", "manufacturer_designation": "SKF 61820", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61820 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 100 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6220.", "Storage matters for open bearings: 61820 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61820 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61820.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61820 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61820-2Z (shields) and 61820-2RSH (contact seals), not suffix-free 61820.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820 bearing?", "a": "A 61820 deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61820 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61820 uses the same ISO 15 envelope (100×125×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61820 have?", "a": "Unless a clearance suffix says otherwise, 61820 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61820 and verify the residual clearance after mounting." }, { "q": "How should 61820 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61820?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820 — the open (unsealed) execution, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 6300 r/min, mass 300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61820-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 320, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61820-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 125 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61820-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 100 mm of 61820-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 100 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6220.", "Contact seals add drag and heat: 61820-2RS runs slower and cooler-limited than the open 61820; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61820-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61820-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820-2RS bearing?", "a": "A 61820-2RS deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61820-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61820-2RS need?", "a": "61820-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61820 with a housing grease fitting instead." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61820-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 3000 r/min, mass 320 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820-2RS." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61820-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 320, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61820-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 125 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61820-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61820 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "The low-drag lip of 61820-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61820-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61820-RSR drags the lip and overheats it.", "SKF catalogues the low-friction seal as 61820-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5300 r/min limiting speed, closer to the open bearing's 10000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820-RSR bearing?", "a": "A 61820-RSR deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61820-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61820-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820-2RZ — two low-friction non-contact elastomer seals, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 5300 r/min, mass 320 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820-RSR." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821", "brand": "SKF", "manufacturer_designation": "SKF 61821", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 310, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "The open 61821 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×130×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61821 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61821 drags the lip and overheats it.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61821 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61821-2Z (shields) and 61821-2RSH (contact seals), not suffix-free 61821.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821 bearing?", "a": "A 61821 deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 105 mm bore?", "a": "618 is an extra-thin section: 130×13 mm, only 12.5 mm radial section at 105 mm bore, far smaller than a 6221, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61821 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61821 uses the same ISO 15 envelope (105×130×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61821 have?", "a": "Unless a clearance suffix says otherwise, 61821 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61821 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61821?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821 — the open (unsealed) execution, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 6300 r/min, mass 310 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61821-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61821-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 330, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61821-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 61821 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "Heat is the enemy of the sealed 61821-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61821-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 61821-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61821-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61821-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821-2RS bearing?", "a": "A 61821-2RS deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61821 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61821 uses the same ISO 15 envelope (105×130×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61821-2RS have?", "a": "Unless a clearance suffix says otherwise, 61821-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61821 and verify the residual clearance after mounting." }, { "q": "How should 61821-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61821-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821-2RS1 — two contact elastomer seals over a lifetime grease fill, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 2800 r/min, mass 330 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821-2RS." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61821-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61821-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 330, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61821-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 130 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61821-2RZ.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 105 mm of 61821-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "RSR low-friction seals on 61821-RSR run faster than contact-seal 61821-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61821-2RS instead.", "The non-contact lip of 61821-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61821-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61821-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5000 r/min limiting speed, closer to the open bearing's 10000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821-RSR bearing?", "a": "A 61821-RSR deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 61821-RSR need?", "a": "61821-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61821 with a housing grease fitting instead." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61821-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 61821-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821-2RZ — two low-friction non-contact elastomer seals, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 5000 r/min, mass 330 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821-RSR." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822", "brand": "SKF", "manufacturer_designation": "SKF 61822", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 470, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61822 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 140 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 110 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6222.", "The open 61822 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×140×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61822 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61822 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61822 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61822-2Z (shields) and 61822-2RSH (contact seals), not suffix-free 61822.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822 bearing?", "a": "A 61822 deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61822 mean?", "a": "A bare 61822 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61822?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822 — the open (unsealed) execution, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 5600 r/min, mass 470 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61822-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61822-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61822-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61822-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61822-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 110 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6222.", "Contact seals add drag and heat: 61822-2RS runs slower and cooler-limited than the open 61822; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61822-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61822-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822-2RS bearing?", "a": "A 61822-2RS deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61822-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61822-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 2600 r/min, mass 600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822-2RS." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61822-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61822-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61822-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61822-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61822-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61822-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 110 mm of 61822-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "RSR low-friction seals on 61822-RSR run faster than contact-seal 61822-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61822-2RS instead.", "The low-drag lip of 61822-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61822-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 4500 r/min limiting speed, closer to the open bearing's 9500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822-RSR bearing?", "a": "A 61822-RSR deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61822 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61822 uses the same ISO 15 envelope (110×140×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61822-RSR have?", "a": "Unless a clearance suffix says otherwise, 61822-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61822 and verify the residual clearance after mounting." }, { "q": "How should 61822-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61822-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822-2RZ — two low-friction non-contact elastomer seals, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 4500 r/min, mass 600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822-RSR." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61822-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61822-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61822-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61822-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824", "brand": "SKF", "manufacturer_designation": "SKF 61824", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 510, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 120 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6224.", "The open 61824 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×150×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61824 units.", "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 61824 and shows up later as two-point loaded raceway wear.", "The open 61824 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61824-2Z (shields) and 61824-2RSH (contact seals), not suffix-free 61824.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824 bearing?", "a": "A 61824 deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61824 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61824 uses the same ISO 15 envelope (120×150×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61824 have?", "a": "Unless a clearance suffix says otherwise, 61824 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61824 and verify the residual clearance after mounting." }, { "q": "How should 61824 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61824?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824 — the open (unsealed) execution, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 5300 r/min, mass 510 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61824-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61824-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 150 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61824-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 120 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6224.", "Contact seals add drag and heat: 61824-2RS runs slower and cooler-limited than the open 61824; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61824-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61824-2RS.", "SKF catalogues the contact-sealed version as 61824-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824-2RS bearing?", "a": "A 61824-2RS deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61824-2RS have?", "a": "Unless a clearance suffix says otherwise, 61824-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61824 and verify the residual clearance after mounting." }, { "q": "How should 61824-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61824-2RS need?", "a": "61824-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61824 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61824-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 2400 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824-2RS." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61824-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61824-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 150 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61824-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "RSR low-friction seals on 61824-RSR run faster than contact-seal 61824-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61824-2RS instead.", "The non-contact lip of 61824-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 120 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 61824-RSR and shows up later as two-point loaded raceway wear.", "Never mix components between two 61824-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the low-friction seal as 61824-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 4300 r/min limiting speed, closer to the open bearing's 8500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824-RSR bearing?", "a": "A 61824-RSR deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61824 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61824 uses the same ISO 15 envelope (120×150×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61824-RSR have?", "a": "Unless a clearance suffix says otherwise, 61824-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61824 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61824-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824-2RZ — two low-friction non-contact elastomer seals, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 4300 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824-RSR." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826", "brand": "SKF", "manufacturer_designation": "SKF 61826", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61826 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 165 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 61826 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "The open 61826 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×165×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61826 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 130 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61826 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61826-2Z (shields) and 61826-2RSH (contact seals), not suffix-free 61826.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826 bearing?", "a": "A 61826 deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61826 need?", "a": "The open 61826 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61826 mean?", "a": "A bare 61826 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61826?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826 — the open (unsealed) execution, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 4800 r/min, mass 750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61826-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61826-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61826-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 61826 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "Heat is the enemy of the sealed 61826-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61826-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 130 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61826-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61826-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826-2RS bearing?", "a": "A 61826-2RS deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61826-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 130 mm bore?", "a": "618 is an extra-thin section: 165×18 mm, only 17.5 mm radial section at 130 mm bore, far smaller than a 6226, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61826 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61826 uses the same ISO 15 envelope (130×165×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61826-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 2200 r/min, mass 930 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826-2RS." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61826-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61826-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61826-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 130 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6226.", "The low-drag lip of 61826-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61826-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 130 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 61826-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 3800 r/min limiting speed, closer to the open bearing's 8000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826-RSR bearing?", "a": "A 61826-RSR deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 61826-RSR need?", "a": "61826-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61826 with a housing grease fitting instead." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61826-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 61826-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826-2RZ — two low-friction non-contact elastomer seals, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 3800 r/min, mass 930 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826-RSR." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61826-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61826-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828", "brand": "SKF", "manufacturer_designation": "SKF 61828", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 820, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 61828 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 140 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6228.", "The open 61828 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×175×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61828 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61828-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 175 mm OD should be round within IT7; an oval bore pinches the outer ring of 61828 and shows up later as two-point loaded raceway wear.", "The open 61828 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61828-2Z (shields) and 61828-2RSH (contact seals), not suffix-free 61828.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828 bearing?", "a": "A 61828 deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61828 have?", "a": "Unless a clearance suffix says otherwise, 61828 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61828 and verify the residual clearance after mounting." }, { "q": "How should 61828 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61828 need?", "a": "The open 61828 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61828?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828 — the open (unsealed) execution, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 4500 r/min, mass 820 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61828-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61828-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61828-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61828-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 990, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61828-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 175 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61828-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 61828 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 140 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6228.", "Contact seals add drag and heat: 61828-2RS runs slower and cooler-limited than the open 61828; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61828-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 140 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 61828-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828-2RS bearing?", "a": "A 61828-2RS deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61828 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61828 uses the same ISO 15 envelope (140×175×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61828-2RS have?", "a": "Unless a clearance suffix says otherwise, 61828-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61828 and verify the residual clearance after mounting." }, { "q": "How should 61828-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61828-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828-2RS1 — two contact elastomer seals over a lifetime grease fill, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 2000 r/min, mass 990 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828-2RS." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61828-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61828-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61828-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61828-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61828-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 990, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61828-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 175 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61828-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "The low-drag lip of 61828-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61828-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 140 mm bore position before relying on it as sealed-for-life.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61828-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 3600 r/min limiting speed, closer to the open bearing's 7500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828-RSR bearing?", "a": "A 61828-RSR deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61828-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61828-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828-2RZ — two low-friction non-contact elastomer seals, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 3600 r/min, mass 990 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828-RSR." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61828-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61828-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61828-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61828-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61830", "brand": "SKF", "manufacturer_designation": "SKF 61830", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.8, "static_load_kN": 61, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61830 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 190 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "The open 61830 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×190×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61830 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 61830 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61830 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61830-2Z (shields) and 61830-2RSH (contact seals), not suffix-free 61830.", "The 48.8/61 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61830 bearing?", "a": "A 61830 deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61830 need?", "a": "The open 61830 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61830 mean?", "a": "A bare 61830 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61830?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61830 — the open (unsealed) execution, 150×190×20 mm per ISO 15. Quoted values: C 48.8 kN, C0 61 kN, Pu 1.96 kN, limiting speed 4300 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61830." } ], "cross_ref": [ { "equiv_sku": "61830-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61830-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61830-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61830-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61830-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61830-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61830-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61830-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61830 MA (machined brass cage, open arrangement) is the same-size execution on the 150×190×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61832", "brand": "SKF", "manufacturer_designation": "SKF 61832", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49.4, "static_load_kN": 64, "fatigue_load_limit_kN": 2, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.", "The open 61832 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×200×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61832 units.", "The housing bore for the 200 mm OD should be round within IT7; an oval bore pinches the outer ring of 61832 and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61832.", "The open 61832 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61832-2Z (shields) and 61832-2RSH (contact seals), not suffix-free 61832.", "The 49.4/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61832 bearing?", "a": "A 61832 deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61832 have?", "a": "Unless a clearance suffix says otherwise, 61832 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61832 and verify the residual clearance after mounting." }, { "q": "How should 61832 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61832 need?", "a": "The open 61832 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61832?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61832 — the open (unsealed) execution, 160×200×20 mm per ISO 15. Quoted values: C 49.4 kN, C0 64 kN, Pu 2 kN, limiting speed 4000 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61832." } ], "cross_ref": [ { "equiv_sku": "61832-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61832-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61832-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61832-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61832-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61832-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61832-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61834", "brand": "SKF", "manufacturer_designation": "SKF 61834", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 61.8, "static_load_kN": 78, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61834 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 215 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 170 mm of 61834 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "The open 61834 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×215×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61834 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61834-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 170 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61834.", "The open 61834 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61834-2Z (shields) and 61834-2RSH (contact seals), not suffix-free 61834.", "The 61.8/78 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61834 bearing?", "a": "A 61834 deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61834 need?", "a": "The open 61834 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61834 bore code work?", "a": "The last two digits of 61834 are bore code 34, giving 34 × 5 = 170 mm bore. The 215 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61834 mean?", "a": "A bare 61834 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61834?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61834 — the open (unsealed) execution, 170×215×22 mm per ISO 15. Quoted values: C 61.8 kN, C0 78 kN, Pu 2.4 kN, limiting speed 3600 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61834." } ], "cross_ref": [ { "equiv_sku": "61834-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61834-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61834-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61834-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61834-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61834-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61834-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61836", "brand": "SKF", "manufacturer_designation": "SKF 61836", "series": "61800-series", "type": "deep_groove", "d_mm": 180, "D_mm": 225, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 62.4, "static_load_kN": 81.5, "fatigue_load_limit_kN": 2.45, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 1750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61836 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 225 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 22.5 mm of radial section separates bore and OD on the 618xx series at 180 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6236.", "The open 61836 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×225×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61836 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61836 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61836-2Z (shields) and 61836-2RSH (contact seals), not suffix-free 61836.", "The 62.4/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61836 bearing?", "a": "A 61836 deep-groove ball bearing has a 180 mm bore, 225 mm outer diameter and 22 mm width (7.087 × 8.858 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 180 mm bore?", "a": "618 is an extra-thin section: 225×22 mm, only 22.5 mm radial section at 180 mm bore, far smaller than a 6236, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61836 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61836 uses the same ISO 15 envelope (180×225×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61836 have?", "a": "Unless a clearance suffix says otherwise, 61836 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61836 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61836?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61836 — the open (unsealed) execution, 180×225×22 mm per ISO 15. Quoted values: C 62.4 kN, C0 81.5 kN, Pu 2.45 kN, limiting speed 3400 r/min, mass 1750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61836." } ], "cross_ref": [ { "equiv_sku": "61836-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61836-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61836-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×225×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61836-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 180×225×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61836", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61838", "brand": "SKF", "manufacturer_designation": "SKF 61838", "series": "61800-series", "type": "deep_groove", "d_mm": 190, "D_mm": 240, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 98, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 2250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61838 carries bore code 38 = 190 mm. Outside diameter 240 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 190 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6238.", "The open 61838 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×240×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61838 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61838 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61838-2Z (shields) and 61838-2RSH (contact seals), not suffix-free 61838.", "The 76.1/98 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61838 bearing?", "a": "A 61838 deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61838 mean?", "a": "A bare 61838 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 190 mm bore?", "a": "618 is an extra-thin section: 240×24 mm, only 25.0 mm radial section at 190 mm bore, far smaller than a 6238, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61838 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61838 uses the same ISO 15 envelope (190×240×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61838?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61838 — the open (unsealed) execution, 190×240×24 mm per ISO 15. Quoted values: C 76.1 kN, C0 98 kN, Pu 2.8 kN, limiting speed 3200 r/min, mass 2250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61838." } ], "cross_ref": [ { "equiv_sku": "61838-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 190×240×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61838-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61838-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×240×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61838-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 190×240×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61838", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61840", "brand": "SKF", "manufacturer_designation": "SKF 61840", "series": "61800-series", "type": "deep_groove", "d_mm": 200, "D_mm": 250, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 102, "fatigue_load_limit_kN": 2.9, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 2350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61840 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 40 by five gives the 200 mm bore; the 250 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 200 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6240.", "Storage matters for open bearings: 61840 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61840 units.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61840 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61840-2Z (shields) and 61840-2RSH (contact seals), not suffix-free 61840.", "The 76.1/102 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61840 bearing?", "a": "A 61840 deep-groove ball bearing has a 200 mm bore, 250 mm outer diameter and 24 mm width (7.874 × 9.843 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61840 mean?", "a": "A bare 61840 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 200 mm bore?", "a": "618 is an extra-thin section: 250×24 mm, only 25.0 mm radial section at 200 mm bore, far smaller than a 6240, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61840 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61840 uses the same ISO 15 envelope (200×250×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61840?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61840 — the open (unsealed) execution, 200×250×24 mm per ISO 15. Quoted values: C 76.1 kN, C0 102 kN, Pu 2.9 kN, limiting speed 3200 r/min, mass 2350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61840." } ], "cross_ref": [ { "equiv_sku": "61840-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 200×250×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61840-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61840-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 200×250×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61840", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61844", "brand": "SKF", "manufacturer_designation": "SKF 61844", "series": "61800-series", "type": "deep_groove", "d_mm": 220, "D_mm": 270, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 78, "static_load_kN": 110, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 4500, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 2550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61844 carries bore code 44 = 220 mm. Outside diameter 270 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 220 mm of 61844 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 25.0 mm of radial section separates bore and OD on the 618xx series at 220 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6244.", "The open 61844 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×270×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61844 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 61844 drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 220 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61844.", "The open 61844 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61844-2Z (shields) and 61844-2RSH (contact seals), not suffix-free 61844.", "The 78/110 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61844 bearing?", "a": "A 61844 deep-groove ball bearing has a 220 mm bore, 270 mm outer diameter and 24 mm width (8.661 × 10.63 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61844 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 220 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61844 need?", "a": "The open 61844 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61844 bore code work?", "a": "The last two digits of 61844 are bore code 44, giving 44 × 5 = 220 mm bore. The 270 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61844?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61844 — the open (unsealed) execution, 220×270×24 mm per ISO 15. Quoted values: C 78 kN, C0 110 kN, Pu 3 kN, limiting speed 2800 r/min, mass 2550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61844." } ], "cross_ref": [ { "equiv_sku": "61844-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 220×270×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61844-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61844-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×270×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61844-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 220×270×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61844", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61848", "brand": "SKF", "manufacturer_designation": "SKF 61848", "series": "61800-series", "type": "deep_groove", "d_mm": 240, "D_mm": 300, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 108, "static_load_kN": 150, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 3900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61848 carries bore code 48 = 240 mm. Outside diameter 300 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 240 mm bore the ring mass is significant: heat 61848 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 240 mm bore has only a 30.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6248.", "The open 61848 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×300×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61848 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 300 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61848.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61848-C3. No clearance suffix means normal CN clearance.", "The open 61848 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61848-2Z (shields) and 61848-2RSH (contact seals), not suffix-free 61848.", "The 108/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61848 bearing?", "a": "A 61848 deep-groove ball bearing has a 240 mm bore, 300 mm outer diameter and 28 mm width (9.449 × 11.811 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61848 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61848 uses the same ISO 15 envelope (240×300×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61848 have?", "a": "Unless a clearance suffix says otherwise, 61848 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61848 and verify the residual clearance after mounting." }, { "q": "How should 61848 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 240 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61848?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61848 — the open (unsealed) execution, 240×300×28 mm per ISO 15. Quoted values: C 108 kN, C0 150 kN, Pu 3.8 kN, limiting speed 2600 r/min, mass 3900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61848." } ], "cross_ref": [ { "equiv_sku": "61848-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 240×300×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61848-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61848-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 240×300×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61848", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61852", "brand": "SKF", "manufacturer_designation": "SKF 61852", "series": "61800-series", "type": "deep_groove", "d_mm": 260, "D_mm": 320, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 163, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 4150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61852 carries bore code 52 = 260 mm. Outside diameter 320 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 260 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 30.0 mm of radial section separates bore and OD on the 618xx series at 260 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6252.", "The open 61852 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×320×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61852 units.", "Measure the shaft, do not trust the drawing: a 260 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61852.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61852 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61852-2Z (shields) and 61852-2RSH (contact seals), not suffix-free 61852.", "The 111/163 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61852 bearing?", "a": "A 61852 deep-groove ball bearing has a 260 mm bore, 320 mm outer diameter and 28 mm width (10.236 × 12.598 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61852 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61852 uses the same ISO 15 envelope (260×320×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61852 have?", "a": "Unless a clearance suffix says otherwise, 61852 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61852 and verify the residual clearance after mounting." }, { "q": "How should 61852 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 260 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61852?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61852 — the open (unsealed) execution, 260×320×28 mm per ISO 15. Quoted values: C 111 kN, C0 163 kN, Pu 4 kN, limiting speed 2400 r/min, mass 4150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61852." } ], "cross_ref": [ { "equiv_sku": "61852-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 260×320×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61852-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 260×320×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61852", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61856", "brand": "SKF", "manufacturer_designation": "SKF 61856", "series": "61800-series", "type": "deep_groove", "d_mm": 280, "D_mm": 350, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 138, "static_load_kN": 200, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 3400, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 6250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61856 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 56 by five gives the 280 mm bore; the 350 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 280 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 35.0 mm of radial section separates bore and OD on the 618xx series at 280 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6256.", "Storage matters for open bearings: 61856 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61856 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 33 mm-wide ring of 61856 drags the lip and overheats it.", "The open 61856 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61856-2Z (shields) and 61856-2RSH (contact seals), not suffix-free 61856.", "The 138/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61856 bearing?", "a": "A 61856 deep-groove ball bearing has a 280 mm bore, 350 mm outer diameter and 33 mm width (11.024 × 13.78 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 280 mm bore?", "a": "618 is an extra-thin section: 350×33 mm, only 35.0 mm radial section at 280 mm bore, far smaller than a 6256, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61856 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61856 uses the same ISO 15 envelope (280×350×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61856 have?", "a": "Unless a clearance suffix says otherwise, 61856 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61856 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61856?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61856 — the open (unsealed) execution, 280×350×33 mm per ISO 15. Quoted values: C 138 kN, C0 200 kN, Pu 4.75 kN, limiting speed 2200 r/min, mass 6250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61856." } ], "cross_ref": [ { "equiv_sku": "61856-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 280×350×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61856", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61856-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61856 MA (machined brass cage, open arrangement) is the same-size execution on the 280×350×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61860", "brand": "SKF", "manufacturer_designation": "SKF 61860", "series": "61800-series", "type": "deep_groove", "d_mm": 300, "D_mm": 380, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 245, "fatigue_load_limit_kN": 5.6, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 8900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61860 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 60 by five gives the 300 mm bore; the 380 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 300 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 300 mm bore the ring mass is significant: heat 61860 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 40.0 mm of radial section separates bore and OD on the 618xx series at 300 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6260.", "The open 61860 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×380×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61860 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 61860 drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61860 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61860-2Z (shields) and 61860-2RSH (contact seals), not suffix-free 61860.", "The 172/245 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61860 bearing?", "a": "A 61860 deep-groove ball bearing has a 300 mm bore, 380 mm outer diameter and 38 mm width (11.811 × 14.961 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61860 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61860 uses the same ISO 15 envelope (300×380×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61860 have?", "a": "Unless a clearance suffix says otherwise, 61860 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61860 and verify the residual clearance after mounting." }, { "q": "How should 61860 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 300 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61860?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61860 — the open (unsealed) execution, 300×380×38 mm per ISO 15. Quoted values: C 172 kN, C0 245 kN, Pu 5.6 kN, limiting speed 2000 r/min, mass 8900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61860." } ], "cross_ref": [ { "equiv_sku": "61860-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 300×380×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61860", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61860-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61860 MA (machined brass cage, open arrangement) is the same-size execution on the 300×380×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61864", "brand": "SKF", "manufacturer_designation": "SKF 61864", "series": "61800-series", "type": "deep_groove", "d_mm": 320, "D_mm": 400, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 255, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 9500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61864 carries bore code 64 = 320 mm. Outside diameter 400 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 320 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6264.", "The open 61864 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×400×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61864 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 400 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61864.", "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61864 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61864-2Z (shields) and 61864-2RSH (contact seals), not suffix-free 61864.", "The 172/255 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61864 bearing?", "a": "A 61864 deep-groove ball bearing has a 320 mm bore, 400 mm outer diameter and 38 mm width (12.598 × 15.748 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61864 mean?", "a": "A bare 61864 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 320 mm bore?", "a": "618 is an extra-thin section: 400×38 mm, only 40.0 mm radial section at 320 mm bore, far smaller than a 6264, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61864 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61864 uses the same ISO 15 envelope (320×400×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61864?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61864 — the open (unsealed) execution, 320×400×38 mm per ISO 15. Quoted values: C 172 kN, C0 255 kN, Pu 5.7 kN, limiting speed 1900 r/min, mass 9500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61864." } ], "cross_ref": [ { "equiv_sku": "61864-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 320×400×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61864", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61864-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61864 MA (machined brass cage, open arrangement) is the same-size execution on the 320×400×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61868", "brand": "SKF", "manufacturer_designation": "SKF 61868", "series": "61800-series", "type": "deep_groove", "d_mm": 340, "D_mm": 420, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 178, "static_load_kN": 275, "fatigue_load_limit_kN": 6, "reference_speed_rpm": 2800, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 10000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61868 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 68 by five gives the 340 mm bore; the 420 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 340 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 340 mm bore the ring mass is significant: heat 61868 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 40.0 mm of radial section separates bore and OD on the 618xx series at 340 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6268.", "Storage matters for open bearings: 61868 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61868 units.", "A 340 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 420 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61868.", "The open 61868 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61868-2Z (shields) and 61868-2RSH (contact seals), not suffix-free 61868.", "The 178/275 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61868 bearing?", "a": "A 61868 deep-groove ball bearing has a 340 mm bore, 420 mm outer diameter and 38 mm width (13.386 × 16.535 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61868 bore code work?", "a": "The last two digits of 61868 are bore code 68, giving 68 × 5 = 340 mm bore. The 420 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61868 mean?", "a": "A bare 61868 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 340 mm bore?", "a": "618 is an extra-thin section: 420×38 mm, only 40.0 mm radial section at 340 mm bore, far smaller than a 6268, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61868?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61868 — the open (unsealed) execution, 340×420×38 mm per ISO 15. Quoted values: C 178 kN, C0 275 kN, Pu 6 kN, limiting speed 1800 r/min, mass 10000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61868." } ], "cross_ref": [ { "equiv_sku": "61868-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 340×420×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61868", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61868-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61868 MA (machined brass cage, open arrangement) is the same-size execution on the 340×420×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900", "brand": "SKF", "manufacturer_designation": "SKF 61900", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 70000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61900 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 22 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Codes 00–03 are the exception series: 61900 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61900 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×22×6 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61900 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 6 mm-wide ring of 61900 drags the lip and overheats it.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 22 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61900.", "The open 61900 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61900-2Z (shields) and 61900-2RSH (contact seals), not suffix-free 61900.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900 bearing?", "a": "A 61900 deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61900 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61900 uses the same ISO 15 envelope (10×22×6 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61900 have?", "a": "Unless a clearance suffix says otherwise, 61900 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61900 and verify the residual clearance after mounting." }, { "q": "How should 61900 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61900?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900 — the open (unsealed) execution, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 45000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900." } ], "cross_ref": [ { "equiv_sku": "61900-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2RS1 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2Z shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61900-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61900 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61900-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Miniature bearings like 61900-2RS (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Heat is the enemy of the sealed 61900-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61900-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61900-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61900-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 20000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 70000 r/min thermal reference speed.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900-2RS bearing?", "a": "A 61900-2RS deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61900-2RS have?", "a": "Unless a clearance suffix says otherwise, 61900-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61900 and verify the residual clearance after mounting." }, { "q": "How should 61900-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61900-2RS need?", "a": "61900-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61900 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61900-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900-2RS1 — two contact elastomer seals over a lifetime grease fill, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 20000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900-2RS." } ], "cross_ref": [ { "equiv_sku": "61900-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2RS1 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2Z shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61900-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61900-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61900-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 22 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61900-2Z.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61900 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section at 10 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61900-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61900-2RS for that.", "Do not wash 61900-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 22 mm OD should be round within IT7; an oval bore pinches the outer ring of 61900-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 61900-2Z (one shield: 61900-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900-ZZ bearing?", "a": "A 61900-ZZ deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 61900-ZZ need?", "a": "61900-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 61900 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61900 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61900-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 61900-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900-2Z — two non-contact sheet-metal shields, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 36000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900-ZZ." } ], "cross_ref": [ { "equiv_sku": "61900-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2RS1 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2Z shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61900-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901", "brand": "SKF", "manufacturer_designation": "SKF 61901", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "reference_speed_rpm": 67000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 11, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61901 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61901 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section at 12 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61901 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×24×6 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61901 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61901 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61901-2Z (shields) and 61901-2RSH (contact seals), not suffix-free 61901.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901 bearing?", "a": "A 61901 deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61901 need?", "a": "The open 61901 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61901 mean?", "a": "A bare 61901 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61901?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901 — the open (unsealed) execution, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 40000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901." } ], "cross_ref": [ { "equiv_sku": "61901-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2RS1 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2Z shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61901-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 11, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61901-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 24 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61901-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Codes 00–03 are the exception series: 61901 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61901-2RS runs slower and cooler-limited than the open 61901; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61901-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 24 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61901-2RS.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 6 mm-wide ring of 61901-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61901-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 19000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 67000 r/min thermal reference speed.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901-2RS bearing?", "a": "A 61901-2RS deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61901-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61901-2RS need?", "a": "61901-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61901 with a housing grease fitting instead." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 61901-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901-2RS1 — two contact elastomer seals over a lifetime grease fill, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 19000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901-2RS." } ], "cross_ref": [ { "equiv_sku": "61901-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2RS1 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2Z shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61901-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61901-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "reference_speed_rpm": 67000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 11, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61901-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 24 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61901-2Z.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Miniature bearings like 61901-ZZ (12 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 619xx thin section at 12 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Do not wash 61901-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61901-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 24 mm OD should be round within IT7; an oval bore pinches the outer ring of 61901-ZZ and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 61901-2Z (one shield: 61901-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901-ZZ bearing?", "a": "A 61901-ZZ deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 61901-ZZ need?", "a": "61901-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61901-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 61901-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901-2Z — two non-contact sheet-metal shields, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 32000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901-ZZ." } ], "cross_ref": [ { "equiv_sku": "61901-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2RS1 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2Z shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61901-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902", "brand": "SKF", "manufacturer_designation": "SKF 61902", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61902 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Miniature bearings like 61902 (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61902 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×28×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61902 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61902 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61902-2Z (shields) and 61902-2RSH (contact seals), not suffix-free 61902.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902 bearing?", "a": "A 61902 deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 15 mm bore?", "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6202 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61902 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61902 uses the same ISO 15 envelope (15×28×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61902 have?", "a": "Unless a clearance suffix says otherwise, 61902 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61902?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902 — the open (unsealed) execution, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 34000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902." } ], "cross_ref": [ { "equiv_sku": "61902-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2RS1 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2Z shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61902-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61902-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 28 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61902-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Miniature bearings like 61902-2RS (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 619xx thin section at 15 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61902-2RS runs slower and cooler-limited than the open 61902; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61902-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61902-2RS.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 61902-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 16000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-2RS bearing?", "a": "A 61902-2RS deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61902-2RS have?", "a": "Unless a clearance suffix says otherwise, 61902-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting." }, { "q": "How should 61902-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61902-2RS need?", "a": "61902-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61902 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61902-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2RS1 — two contact elastomer seals over a lifetime grease fill, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 16000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-2RS." } ], "cross_ref": [ { "equiv_sku": "61902-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2RS1 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2Z shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61902-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61902-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 28 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61902-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section at 15 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61902-RSR run faster than contact-seal 61902-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61902-2RS instead.", "The non-contact lip of 61902-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61902-RSR.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61902-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-RSR bearing?", "a": "A 61902-RSR deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61902 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61902 uses the same ISO 15 envelope (15×28×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61902-RSR have?", "a": "Unless a clearance suffix says otherwise, 61902-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting." }, { "q": "How should 61902-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61902-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2RZ — two low-friction non-contact elastomer seals, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 28000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-RSR." } ], "cross_ref": [ { "equiv_sku": "61902-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2RS1 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2Z shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61902-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61902-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 28 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61902-2Z.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section at 15 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61902-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61902-2RS for that.", "Do not wash 61902-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 61902-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61902-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 61902-2Z (one shield: 61902-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-ZZ bearing?", "a": "A 61902-ZZ deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61902 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61902 uses the same ISO 15 envelope (15×28×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61902-ZZ have?", "a": "Unless a clearance suffix says otherwise, 61902-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting." }, { "q": "How should 61902-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61902-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2Z — two non-contact sheet-metal shields, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 28000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-ZZ." } ], "cross_ref": [ { "equiv_sku": "61902-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2RS1 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2Z shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903", "brand": "SKF", "manufacturer_designation": "SKF 61903", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Codes 00–03 are the exception series: 61903 takes its 17 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 619xx thin section at 17 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61903 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61903 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 30 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61903.", "The open 61903 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61903-2Z (shields) and 61903-2RSH (contact seals), not suffix-free 61903.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903 bearing?", "a": "A 61903 deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61903 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61903 uses the same ISO 15 envelope (17×30×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61903 have?", "a": "Unless a clearance suffix says otherwise, 61903 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61903 and verify the residual clearance after mounting." }, { "q": "How should 61903 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61903?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903 — the open (unsealed) execution, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 32000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903." } ], "cross_ref": [ { "equiv_sku": "61903-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2RS1 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2Z shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61903-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61903-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61903 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61903-2RS runs slower and cooler-limited than the open 61903; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61903-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 30 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61903-2RS.", "SKF catalogues the contact-sealed version as 61903-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-2RS bearing?", "a": "A 61903-2RS deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61900 compare with other series at the same 17 mm bore?", "a": "619 is a thin section one step above 618: 30×7 mm with a 6.5 mm radial section at 17 mm bore; a 6203 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61903 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61903 uses the same ISO 15 envelope (17×30×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61903-2RS have?", "a": "Unless a clearance suffix says otherwise, 61903-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61903 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61903-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2RS1 — two contact elastomer seals over a lifetime grease fill, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 14000 r/min, mass 17 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-2RS." } ], "cross_ref": [ { "equiv_sku": "61903-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2RS1 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2Z shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61903-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61903-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 30 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61903-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Miniature bearings like 61903-RSR (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61903-RSR run faster than contact-seal 61903-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61903-2RS instead.", "The low-drag lip of 61903-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61903-RSR.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 61903-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-RSR bearing?", "a": "A 61903-RSR deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61903-RSR have?", "a": "Unless a clearance suffix says otherwise, 61903-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61903 and verify the residual clearance after mounting." }, { "q": "How should 61903-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61903-RSR need?", "a": "61903-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61903 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61903-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2RZ — two low-friction non-contact elastomer seals, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 26000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-RSR." } ], "cross_ref": [ { "equiv_sku": "61903-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2RS1 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2Z shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61903-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61903-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 30 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61903-2Z.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Codes 00–03 are the exception series: 61903 takes its 17 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61903-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61903-2RS for that.", "Shielded 61903-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 61903-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 61903-2Z (one shield: 61903-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-ZZ bearing?", "a": "A 61903-ZZ deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61903-ZZ have?", "a": "Unless a clearance suffix says otherwise, 61903-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61903 and verify the residual clearance after mounting." }, { "q": "How should 61903-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61903-ZZ need?", "a": "61903-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 61903-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2Z — two non-contact sheet-metal shields, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 26000 r/min, mass 17 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-ZZ." } ], "cross_ref": [ { "equiv_sku": "61903-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2RS1 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2Z shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61904-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "reference_speed_rpm": 43000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61904-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61904-RSR.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61904-RSR run faster than contact-seal 61904-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61904-2RS instead.", "The non-contact lip of 61904-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61904-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61904-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 20000 r/min limiting speed, closer to the open bearing's 43000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904-RSR bearing?", "a": "A 61904-RSR deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61904-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with an 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61904 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61904 uses the same ISO 15 envelope (20×37×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61904-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904-2RZ — two low-friction non-contact elastomer seals, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 20000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61904-RSR." } ], "cross_ref": [ { "equiv_sku": "61904-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61904-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904-2RS1 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61904", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61904-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61905-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "reference_speed_rpm": 36000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61905-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 42 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61905-2RZ.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "A 25 mm shaft for 61905 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section at 25 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61905-RSR run faster than contact-seal 61905-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61905-2RS instead.", "The non-contact lip of 61905-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61905-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 61905-RSR drags the lip and overheats it.", "SKF catalogues the low-friction seal as 61905-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 18000 r/min limiting speed, closer to the open bearing's 36000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905-RSR bearing?", "a": "A 61905-RSR deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61905 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61905 uses the same ISO 15 envelope (25×42×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61905-RSR have?", "a": "Unless a clearance suffix says otherwise, 61905-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61905 and verify the residual clearance after mounting." }, { "q": "How should 61905-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61905-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905-2RZ — two low-friction non-contact elastomer seals, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 18000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61905-RSR." } ], "cross_ref": [ { "equiv_sku": "61905-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61905-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61905-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61905-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61905-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61905-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61905-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61905-2RS1 shares the 25×42×9 mm envelope but rates differently (7.02/4.3 kN vs 6.05/4.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61905-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61906-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 51, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61906-2RZ.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section at 30 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61906-RSR run faster than contact-seal 61906-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61906-2RS instead.", "The low-drag lip of 61906-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The housing bore for the 47 mm OD should be round within IT7; an oval bore pinches the outer ring of 61906-RSR and shows up later as two-point loaded raceway wear.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61906-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906-RSR bearing?", "a": "A 61906-RSR deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61906-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with an 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61906 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61906 uses the same ISO 15 envelope (30×47×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61906-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906-2RZ — two low-friction non-contact elastomer seals, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 15000 r/min, mass 51 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61906-RSR." } ], "cross_ref": [ { "equiv_sku": "61906-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61906-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906-2RS1 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61906", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61906-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61907-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "reference_speed_rpm": 26000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61907-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61907-RSR.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61907-RSR run faster than contact-seal 61907-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61907-2RS instead.", "The low-drag lip of 61907-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The housing bore for the 55 mm OD should be round within IT7; an oval bore pinches the outer ring of 61907-RSR and shows up later as two-point loaded raceway wear.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61907-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 26000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907-RSR bearing?", "a": "A 61907-RSR deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61907 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61907 uses the same ISO 15 envelope (35×55×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61907-RSR have?", "a": "Unless a clearance suffix says otherwise, 61907-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61907 and verify the residual clearance after mounting." }, { "q": "How should 61907-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61907-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907-2RZ — two low-friction non-contact elastomer seals, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 13000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61907-RSR." } ], "cross_ref": [ { "equiv_sku": "61907-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61907-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61907-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61907-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61907-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61907-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61907-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61907-2RS1 shares the 35×55×10 mm envelope but rates differently (10.8/7.8 kN vs 9.36/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61907-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61908-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61908-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61908-RSR.", "The 619xx thin section at 40 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61908-RSR run faster than contact-seal 61908-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61908-2RS instead.", "The non-contact lip of 61908-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61908-RSR.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 61908-RSR drags the lip and overheats it.", "SKF catalogues the low-friction seal as 61908-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908-RSR bearing?", "a": "A 61908-RSR deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 61908-RSR need?", "a": "61908-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61908 with a housing grease fitting instead." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61908-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 61908-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908-2RZ — two low-friction non-contact elastomer seals, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 12000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61908-RSR." } ], "cross_ref": [ { "equiv_sku": "61908-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61908-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61908-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61908-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61908-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61908-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61908-2RS1 shares the 40×62×12 mm envelope but rates differently (13.8/10 kN vs 11.9/9.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61908-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61909-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61909-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 68 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61909-2RZ.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "A 45 mm shaft for 61909 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The low-drag lip of 61909-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61909-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 68 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61909-RSR.", "Measure the shaft, do not trust the drawing: a 45 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61909-RSR.", "SKF catalogues the low-friction seal as 61909-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 10000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909-RSR bearing?", "a": "A 61909-RSR deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61909-RSR have?", "a": "Unless a clearance suffix says otherwise, 61909-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61909 and verify the residual clearance after mounting." }, { "q": "How should 61909-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61909-RSR need?", "a": "61909-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61909 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61909-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909-2RZ — two low-friction non-contact elastomer seals, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 10000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61909-RSR." } ], "cross_ref": [ { "equiv_sku": "61909-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61909-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61909-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61909-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61909-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61909-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61909-2RS1 shares the 45×68×12 mm envelope but rates differently (14/10.8 kN vs 12.1/10.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61909-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61910-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61910-2RZ.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61910 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 50 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The low-drag lip of 61910-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61910-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 61910-RSR and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 61910-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9500 r/min limiting speed, closer to the open bearing's 19000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910-RSR bearing?", "a": "A 61910-RSR deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with an 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61910 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61910 uses the same ISO 15 envelope (50×72×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61910-RSR have?", "a": "Unless a clearance suffix says otherwise, 61910-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61910 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61910-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910-2RZ — two low-friction non-contact elastomer seals, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 9500 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61910-RSR." } ], "cross_ref": [ { "equiv_sku": "61910-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61910-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61910-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61910-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61910-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61910-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61910-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61911-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61911-2RZ.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61911-RSR run faster than contact-seal 61911-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61911-2RS instead.", "The low-drag lip of 61911-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Never mix components between two 61911-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61911-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911-RSR bearing?", "a": "A 61911-RSR deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61911 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61911 uses the same ISO 15 envelope (55×80×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61911-RSR have?", "a": "Unless a clearance suffix says otherwise, 61911-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61911 and verify the residual clearance after mounting." }, { "q": "How should 61911-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61911-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911-2RZ — two low-friction non-contact elastomer seals, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 8500 r/min, mass 190 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61911-RSR." } ], "cross_ref": [ { "equiv_sku": "61911-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61911-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912", "brand": "SKF", "manufacturer_designation": "SKF 61912", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 12, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61912 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61912 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×85×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61912 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61912 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 60 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61912.", "The open 61912 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61912-2Z (shields) and 61912-2RSH (contact seals), not suffix-free 61912.", "The 16.5/12 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912 bearing?", "a": "A 61912 deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61912 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61912 need?", "a": "The open 61912 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61912 bore code work?", "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61912?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912 — the open (unsealed) execution, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 12 kN, Pu 0.6 kN, limiting speed 10000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912." } ], "cross_ref": [ { "equiv_sku": "61912-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61912-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61912-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61912-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 12, "fatigue_load_limit_kN": 0.6, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61912-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61912 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section at 60 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61912-2RS runs slower and cooler-limited than the open 61912; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61912-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Vibration during standstill brinells the raceways of a 60 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 85 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61912-2RS.", "SKF catalogues the contact-sealed version as 61912-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed.", "The 16.5/12 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912-2RS bearing?", "a": "A 61912-2RS deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61912 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61912 uses the same ISO 15 envelope (60×85×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61912-2RS have?", "a": "Unless a clearance suffix says otherwise, 61912-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61912 and verify the residual clearance after mounting." }, { "q": "How should 61912-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61912-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 12 kN, Pu 0.6 kN, limiting speed 4500 r/min, mass 210 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912-2RS." } ], "cross_ref": [ { "equiv_sku": "61912-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61912-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61912-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61912-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61912-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 14.3, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61912-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 85 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61912-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61912 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 60 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The low-drag lip of 61912-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61912-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61912-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8000 r/min limiting speed, closer to the open bearing's 16000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.5/14.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912-RSR bearing?", "a": "A 61912-RSR deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61912 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61912 uses the same ISO 15 envelope (60×85×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61912-RSR have?", "a": "Unless a clearance suffix says otherwise, 61912-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61912 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61912-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912-2RZ — two low-friction non-contact elastomer seals, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14.3 kN, Pu 0.6 kN, limiting speed 8000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912-RSR." } ], "cross_ref": [ { "equiv_sku": "61912-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61912-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61912-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61912-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61912-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913", "brand": "SKF", "manufacturer_designation": "SKF 61913", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61913 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section at 65 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61913 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61913 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61913-C3. No clearance suffix means normal CN clearance.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61913 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61913-2Z (shields) and 61913-2RSH (contact seals), not suffix-free 61913.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913 bearing?", "a": "A 61913 deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61913 bore code work?", "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61913 mean?", "a": "A bare 61913 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61913?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913 — the open (unsealed) execution, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 9500 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913." } ], "cross_ref": [ { "equiv_sku": "61913-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61913-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61913-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61913-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61913-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61913-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61913-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 90 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61913-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61913 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Heat is the enemy of the sealed 61913-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61913-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61913-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61913-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913-2RS bearing?", "a": "A 61913-2RS deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61913 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61913 uses the same ISO 15 envelope (65×90×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61913-2RS have?", "a": "Unless a clearance suffix says otherwise, 61913-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61913 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61913-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 4300 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913-2RS." } ], "cross_ref": [ { "equiv_sku": "61913-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61913-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61913-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61913-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61913-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61913-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61913-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61913-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61913 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section at 65 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61913-RSR run faster than contact-seal 61913-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61913-2RS instead.", "The low-drag lip of 61913-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 61913-RSR and shows up later as two-point loaded raceway wear.", "SKF catalogues the low-friction seal as 61913-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913-RSR bearing?", "a": "A 61913-RSR deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61913 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61913 uses the same ISO 15 envelope (65×90×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61913-RSR have?", "a": "Unless a clearance suffix says otherwise, 61913-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61913 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61913-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913-2RZ — two low-friction non-contact elastomer seals, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 7500 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913-RSR." } ], "cross_ref": [ { "equiv_sku": "61913-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61913-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61913-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61913-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61913-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61913-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61913-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914", "brand": "SKF", "manufacturer_designation": "SKF 61914", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 14000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 340, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61914 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 100 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61914 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61914 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×100×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61914 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61914.", "The open 61914 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61914-2Z (shields) and 61914-2RSH (contact seals), not suffix-free 61914.", "The 23.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914 bearing?", "a": "A 61914 deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61914 need?", "a": "The open 61914 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61914 mean?", "a": "A bare 61914 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61914?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914 — the open (unsealed) execution, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 18.3 kN, Pu 0.9 kN, limiting speed 8500 r/min, mass 340 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61914-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61914-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61914-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Heat is the enemy of the sealed 61914-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61914-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61914-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed.", "The 23.8/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914-2RS bearing?", "a": "A 61914-2RS deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61914-2RS have?", "a": "Unless a clearance suffix says otherwise, 61914-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61914 and verify the residual clearance after mounting." }, { "q": "How should 61914-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61914-2RS need?", "a": "61914-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61914 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61914-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 4000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914-2RS." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61914-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61914-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61914-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61914-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61914-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61914-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61914-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section at 70 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61914-RSR run faster than contact-seal 61914-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61914-2RS instead.", "The non-contact lip of 61914-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61914-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61914-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7000 r/min limiting speed, closer to the open bearing's 14000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 23.8/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914-RSR bearing?", "a": "A 61914-RSR deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61914-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61914-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914-2RZ — two low-friction non-contact elastomer seals, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 7000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914-RSR." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61914-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61914-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61914-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61914-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61914-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915", "brand": "SKF", "manufacturer_designation": "SKF 61915", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 19.3, "fatigue_load_limit_kN": 0.965, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61915 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 105 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61915 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61915 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61915 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 61915 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61915 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61915-2Z (shields) and 61915-2RSH (contact seals), not suffix-free 61915.", "The 24.2/19.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915 bearing?", "a": "A 61915 deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61915 mean?", "a": "A bare 61915 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61915 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61915 uses the same ISO 15 envelope (75×105×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61915?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915 — the open (unsealed) execution, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 19.3 kN, Pu 0.965 kN, limiting speed 8000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61915-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61915-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 22.4, "fatigue_load_limit_kN": 0.965, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61915-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 105 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61915-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61915 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 75 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61915-2RS runs slower and cooler-limited than the open 61915; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61915-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61915-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 105 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61915-2RS.", "SKF catalogues the contact-sealed version as 61915-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed.", "The 24.2/22.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915-2RS bearing?", "a": "A 61915-2RS deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61915-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61915 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61915 uses the same ISO 15 envelope (75×105×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61915-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 22.4 kN, Pu 0.965 kN, limiting speed 3600 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915-2RS." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61915-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61915-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61915-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61915-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 22.4, "fatigue_load_limit_kN": 0.965, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61915-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.", "The 619xx thin section at 75 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61915-RSR run faster than contact-seal 61915-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61915-2RS instead.", "The non-contact lip of 61915-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 105 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61915-RSR.", "SKF catalogues the low-friction seal as 61915-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6300 r/min limiting speed, closer to the open bearing's 13000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 24.2/22.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915-RSR bearing?", "a": "A 61915-RSR deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61915-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61915 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61915 uses the same ISO 15 envelope (75×105×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61915-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915-2RZ — two low-friction non-contact elastomer seals, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 22.4 kN, Pu 0.965 kN, limiting speed 6300 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915-RSR." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61915-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61915-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61915-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916", "brand": "SKF", "manufacturer_designation": "SKF 61916", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 80 mm of 61916 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61916 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×110×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61916 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61916 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61916-2Z (shields) and 61916-2RSH (contact seals), not suffix-free 61916.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916 bearing?", "a": "A 61916 deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61916 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61916 need?", "a": "The open 61916 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61916?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916 — the open (unsealed) execution, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 7500 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61916-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61916-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61916-2RS runs slower and cooler-limited than the open 61916; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61916-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61916-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61916-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916-2RS bearing?", "a": "A 61916-2RS deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61916-2RS have?", "a": "Unless a clearance suffix says otherwise, 61916-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61916 and verify the residual clearance after mounting." }, { "q": "How should 61916-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61916-2RS need?", "a": "61916-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61916 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61916-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 3400 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916-2RS." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61916-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61916-2RZ.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 80 mm of 61916-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 80 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The low-drag lip of 61916-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61916-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61916-RSR.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61916-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916-RSR bearing?", "a": "A 61916-RSR deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61916-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 80 mm bore?", "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61916 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61916 uses the same ISO 15 envelope (80×110×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61916-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916-2RZ — two low-friction non-contact elastomer seals, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 6000 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916-RSR." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61917", "brand": "SKF", "manufacturer_designation": "SKF 61917", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 31.9, "static_load_kN": 30, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61917 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 120 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61917 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×120×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61917 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61917 drags the lip and overheats it.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61917 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61917-2Z (shields) and 61917-2RSH (contact seals), not suffix-free 61917.", "The 31.9/30 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61917 bearing?", "a": "A 61917 deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61917 have?", "a": "Unless a clearance suffix says otherwise, 61917 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61917 and verify the residual clearance after mounting." }, { "q": "How should 61917 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61917 need?", "a": "The open 61917 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61917?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61917 — the open (unsealed) execution, 85×120×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 30 kN, Pu 1.25 kN, limiting speed 7000 r/min, mass 550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61917." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61917-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61917-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61917-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61918", "brand": "SKF", "manufacturer_designation": "SKF 61918", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.2, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 590, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61918 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×125×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61918 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61918.", "The open 61918 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61918-2Z (shields) and 61918-2RSH (contact seals), not suffix-free 61918.", "The 33.2/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61918 bearing?", "a": "A 61918 deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61918 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61918 need?", "a": "The open 61918 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61918?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61918 — the open (unsealed) execution, 90×125×18 mm per ISO 15. Quoted values: C 33.2 kN, C0 31.5 kN, Pu 1.29 kN, limiting speed 6700 r/min, mass 590 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61918." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61918-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61918-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61918-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61918-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61918-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61919", "brand": "SKF", "manufacturer_designation": "SKF 61919", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.8, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61919 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 130 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 61919 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61919 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×130×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61919 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61919 drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61919 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61919-2Z (shields) and 61919-2RSH (contact seals), not suffix-free 61919.", "The 33.8/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61919 bearing?", "a": "A 61919 deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61919 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61919 need?", "a": "The open 61919 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61919?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61919 — the open (unsealed) execution, 95×130×18 mm per ISO 15. Quoted values: C 33.8 kN, C0 33.5 kN, Pu 1.34 kN, limiting speed 6300 r/min, mass 610 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61919." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61919-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61919-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61919-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61919-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61919-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61919-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.8, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.34, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61919-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 95 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61919-2RS runs slower and cooler-limited than the open 61919; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61919-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61919-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61919-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 33.8/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61919-2RS bearing?", "a": "A 61919-2RS deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61919 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61919 uses the same ISO 15 envelope (95×130×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61919-2RS have?", "a": "Unless a clearance suffix says otherwise, 61919-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61919 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61919-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61919-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×130×18 mm per ISO 15. Quoted values: C 33.8 kN, C0 33.5 kN, Pu 1.34 kN, limiting speed 3000 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61919-2RS." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61919-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61919-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61919-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61919-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61919-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61920", "brand": "SKF", "manufacturer_designation": "SKF 61920", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.3, "static_load_kN": 41.5, "fatigue_load_limit_kN": 1.63, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 830, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61920 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 100 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61920 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×140×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61920 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 100 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61920.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61920 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61920-2Z (shields) and 61920-2RSH (contact seals), not suffix-free 61920.", "The 42.3/41.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61920 bearing?", "a": "A 61920 deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61920 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61920 uses the same ISO 15 envelope (100×140×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61920 have?", "a": "Unless a clearance suffix says otherwise, 61920 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61920 and verify the residual clearance after mounting." }, { "q": "How should 61920 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61920?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61920 — the open (unsealed) execution, 100×140×20 mm per ISO 15. Quoted values: C 42.3 kN, C0 41.5 kN, Pu 1.63 kN, limiting speed 6000 r/min, mass 830 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61920." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61920-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61920-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61920-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61921", "brand": "SKF", "manufacturer_designation": "SKF 61921", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44.2, "static_load_kN": 44, "fatigue_load_limit_kN": 1.7, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 870, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61921 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 145 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 105 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61921 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×145×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61921 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61921 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61921-2Z (shields) and 61921-2RSH (contact seals), not suffix-free 61921.", "The 44.2/44 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61921 bearing?", "a": "A 61921 deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61921 need?", "a": "The open 61921 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61921 mean?", "a": "A bare 61921 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61921?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61921 — the open (unsealed) execution, 105×145×20 mm per ISO 15. Quoted values: C 44.2 kN, C0 44 kN, Pu 1.7 kN, limiting speed 5600 r/min, mass 870 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61921." } ], "cross_ref": [ { "equiv_sku": "61921-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61921-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61921-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61921-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61921-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61921-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61922", "brand": "SKF", "manufacturer_designation": "SKF 61922", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 43.6, "static_load_kN": 45, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 110 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61922 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×150×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61922 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 110 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61922.", "Never mix components between two 61922 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61922 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61922-2Z (shields) and 61922-2RSH (contact seals), not suffix-free 61922.", "The 43.6/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61922 bearing?", "a": "A 61922 deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61922 have?", "a": "Unless a clearance suffix says otherwise, 61922 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61922 and verify the residual clearance after mounting." }, { "q": "How should 61922 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61922 need?", "a": "The open 61922 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61922?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61922 — the open (unsealed) execution, 110×150×20 mm per ISO 15. Quoted values: C 43.6 kN, C0 45 kN, Pu 1.66 kN, limiting speed 5600 r/min, mass 900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61922." } ], "cross_ref": [ { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61922-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61922-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61922-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61922-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61922 MA (machined brass cage, open arrangement) is the same-size execution on the 110×150×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61924", "brand": "SKF", "manufacturer_designation": "SKF 61924", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 55.3, "static_load_kN": 57, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61924 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 165 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 120 mm of 61924 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 120 mm bore (22.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61924 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×165×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61924 units.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Never mix components between two 61924 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61924 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61924-2Z (shields) and 61924-2RSH (contact seals), not suffix-free 61924.", "The 55.3/57 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61924 bearing?", "a": "A 61924 deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61924 need?", "a": "The open 61924 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61924 bore code work?", "a": "The last two digits of 61924 are bore code 24, giving 24 × 5 = 120 mm bore. The 165 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61924 mean?", "a": "A bare 61924 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61924?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61924 — the open (unsealed) execution, 120×165×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 57 kN, Pu 2.04 kN, limiting speed 5000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61924." } ], "cross_ref": [ { "equiv_sku": "61924-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61924-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61924-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61924-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61924-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61924-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61924 MA (machined brass cage, open arrangement) is the same-size execution on the 120×165×22 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61926", "brand": "SKF", "manufacturer_designation": "SKF 61926", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 65, "static_load_kN": 67, "fatigue_load_limit_kN": 2.28, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61926 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 180 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 130 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61926 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×180×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61926 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61926-C3. No clearance suffix means normal CN clearance.", "The open 61926 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61926-2Z (shields) and 61926-2RSH (contact seals), not suffix-free 61926.", "The 65/67 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61926 bearing?", "a": "A 61926 deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61926 bore code work?", "a": "The last two digits of 61926 are bore code 26, giving 26 × 5 = 130 mm bore. The 180 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61926 mean?", "a": "A bare 61926 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 130 mm bore?", "a": "619 is a thin section one step above 618: 180×24 mm with a 25.0 mm radial section at 130 mm bore; a 6226 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61926?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61926 — the open (unsealed) execution, 130×180×24 mm per ISO 15. Quoted values: C 65 kN, C0 67 kN, Pu 2.28 kN, limiting speed 4500 r/min, mass 1600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61926." } ], "cross_ref": [ { "equiv_sku": "61926-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61926-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61926-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61926-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61926-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61928", "brand": "SKF", "manufacturer_designation": "SKF 61928", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66.3, "static_load_kN": 72, "fatigue_load_limit_kN": 2.36, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 61928 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 140 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61928 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×190×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61928 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 61928 drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61928 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61928-2Z (shields) and 61928-2RSH (contact seals), not suffix-free 61928.", "The 66.3/72 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61928 bearing?", "a": "A 61928 deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61928 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61928 uses the same ISO 15 envelope (140×190×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61928 have?", "a": "Unless a clearance suffix says otherwise, 61928 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61928 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61928?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61928 — the open (unsealed) execution, 140×190×24 mm per ISO 15. Quoted values: C 66.3 kN, C0 72 kN, Pu 2.36 kN, limiting speed 4300 r/min, mass 1700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61928." } ], "cross_ref": [ { "equiv_sku": "61928-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61928-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61928-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61928-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61928-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61928 MA (machined brass cage, open arrangement) is the same-size execution on the 140×190×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61932", "brand": "SKF", "manufacturer_designation": "SKF 61932", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92.3, "static_load_kN": 98, "fatigue_load_limit_kN": 3.05, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61932 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 220 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 160 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61932 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×220×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61932 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61932.", "The open 61932 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61932-2Z (shields) and 61932-2RSH (contact seals), not suffix-free 61932.", "The 92.3/98 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61932 bearing?", "a": "A 61932 deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61932 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61932 need?", "a": "The open 61932 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61932 bore code work?", "a": "The last two digits of 61932 are bore code 32, giving 32 × 5 = 160 mm bore. The 220 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61932?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61932 — the open (unsealed) execution, 160×220×28 mm per ISO 15. Quoted values: C 92.3 kN, C0 98 kN, Pu 3.05 kN, limiting speed 3800 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61932." } ], "cross_ref": [ { "equiv_sku": "61932-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61932-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61932-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61932-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61932-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61932-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61932-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61932", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61932-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61932 MA (machined brass cage, open arrangement) is the same-size execution on the 160×220×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61936", "brand": "SKF", "manufacturer_designation": "SKF 61936", "series": "61900-series", "type": "deep_groove", "d_mm": 180, "D_mm": 250, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 119, "static_load_kN": 134, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 5000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61936 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 250 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 180 mm of 61936 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 180 mm bore (35.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61936 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61936 units.", "Never mix components between two 61936 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 250 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61936.", "The open 61936 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61936-2Z (shields) and 61936-2RSH (contact seals), not suffix-free 61936.", "The 119/134 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61936 bearing?", "a": "A 61936 deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61936 mean?", "a": "A bare 61936 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 180 mm bore?", "a": "619 is a thin section one step above 618: 250×33 mm with a 35.0 mm radial section at 180 mm bore; a 6236 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61936 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61936 uses the same ISO 15 envelope (180×250×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61936?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61936 — the open (unsealed) execution, 180×250×33 mm per ISO 15. Quoted values: C 119 kN, C0 134 kN, Pu 3.9 kN, limiting speed 3200 r/min, mass 5000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61936." } ], "cross_ref": [ { "equiv_sku": "61936-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61936-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61936-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61936-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61936", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61936-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61936 MA (machined brass cage, open arrangement) is the same-size execution on the 180×250×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61938", "brand": "SKF", "manufacturer_designation": "SKF 61938", "series": "61900-series", "type": "deep_groove", "d_mm": 190, "D_mm": 260, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 117, "static_load_kN": 134, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 4500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61938 carries bore code 38 = 190 mm. Outside diameter 260 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 190 mm of 61938 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 190 mm bore (35.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61938 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61938 units.", "Never mix components between two 61938 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61938 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61938-2Z (shields) and 61938-2RSH (contact seals), not suffix-free 61938.", "The 117/134 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61938 bearing?", "a": "A 61938 deep-groove ball bearing has a 190 mm bore, 260 mm outer diameter and 33 mm width (7.48 × 10.236 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61938 need?", "a": "The open 61938 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61938 bore code work?", "a": "The last two digits of 61938 are bore code 38, giving 38 × 5 = 190 mm bore. The 260 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61938 mean?", "a": "A bare 61938 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61938?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61938 — the open (unsealed) execution, 190×260×33 mm per ISO 15. Quoted values: C 117 kN, C0 134 kN, Pu 3.8 kN, limiting speed 3200 r/min, mass 4500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61938." } ], "cross_ref": [ { "equiv_sku": "61938-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 190×260×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61938-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61938-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61938", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61938-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61938 MA (machined brass cage, open arrangement) is the same-size execution on the 190×260×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61940", "brand": "SKF", "manufacturer_designation": "SKF 61940", "series": "61900-series", "type": "deep_groove", "d_mm": 200, "D_mm": 280, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 148, "static_load_kN": 166, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 6300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61940 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 40 by five gives the 200 mm bore; the 280 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 200 mm of 61940 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 200 mm bore (40.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61940 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×280×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61940 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 280 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61940.", "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61940 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61940-2Z (shields) and 61940-2RSH (contact seals), not suffix-free 61940.", "The 148/166 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61940 bearing?", "a": "A 61940 deep-groove ball bearing has a 200 mm bore, 280 mm outer diameter and 38 mm width (7.874 × 11.024 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61940 have?", "a": "Unless a clearance suffix says otherwise, 61940 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61940 and verify the residual clearance after mounting." }, { "q": "How should 61940 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61940 need?", "a": "The open 61940 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61940?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61940 — the open (unsealed) execution, 200×280×38 mm per ISO 15. Quoted values: C 148 kN, C0 166 kN, Pu 4.55 kN, limiting speed 3000 r/min, mass 6300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61940." } ], "cross_ref": [ { "equiv_sku": "61940-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61940-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61940-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61940-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 200×280×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61940", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61940-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61940 MA (machined brass cage, open arrangement) is the same-size execution on the 200×280×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61944", "brand": "SKF", "manufacturer_designation": "SKF 61944", "series": "61900-series", "type": "deep_groove", "d_mm": 220, "D_mm": 300, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 151, "static_load_kN": 180, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 6800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61944 carries bore code 44 = 220 mm. Outside diameter 300 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 220 mm bore the ring mass is significant: heat 61944 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 220 mm bore (40.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61944 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×300×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61944 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 61944 drags the lip and overheats it.", "Never mix components between two 61944 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61944 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61944-2Z (shields) and 61944-2RSH (contact seals), not suffix-free 61944.", "The 151/180 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61944 bearing?", "a": "A 61944 deep-groove ball bearing has a 220 mm bore, 300 mm outer diameter and 38 mm width (8.661 × 11.811 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61944 need?", "a": "The open 61944 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61944 bore code work?", "a": "The last two digits of 61944 are bore code 44, giving 44 × 5 = 220 mm bore. The 300 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61944 mean?", "a": "A bare 61944 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61944?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61944 — the open (unsealed) execution, 220×300×38 mm per ISO 15. Quoted values: C 151 kN, C0 180 kN, Pu 4.75 kN, limiting speed 2600 r/min, mass 6800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61944." } ], "cross_ref": [ { "equiv_sku": "61944-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61944-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61944-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61944-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61944", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61944-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61944 MA (machined brass cage, open arrangement) is the same-size execution on the 220×300×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61948", "brand": "SKF", "manufacturer_designation": "SKF 61948", "series": "61900-series", "type": "deep_groove", "d_mm": 240, "D_mm": 320, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 159, "static_load_kN": 200, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 7300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61948 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 48 by five gives the 240 mm bore; the 320 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 240 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 240 mm bore (40.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61948 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×320×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61948 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 320 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61948.", "The open 61948 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61948-2Z (shields) and 61948-2RSH (contact seals), not suffix-free 61948.", "The 159/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61948 bearing?", "a": "A 61948 deep-groove ball bearing has a 240 mm bore, 320 mm outer diameter and 38 mm width (9.449 × 12.598 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61948 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 240 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61948 need?", "a": "The open 61948 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61948 bore code work?", "a": "The last two digits of 61948 are bore code 48, giving 48 × 5 = 240 mm bore. The 320 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61948?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61948 — the open (unsealed) execution, 240×320×38 mm per ISO 15. Quoted values: C 159 kN, C0 200 kN, Pu 5.1 kN, limiting speed 2400 r/min, mass 7300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61948." } ], "cross_ref": [ { "equiv_sku": "61948-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61948-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61948-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61948-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61948", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61948-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61948 MA (machined brass cage, open arrangement) is the same-size execution on the 240×320×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61952", "brand": "SKF", "manufacturer_designation": "SKF 61952", "series": "61900-series", "type": "deep_groove", "d_mm": 260, "D_mm": 360, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 212, "static_load_kN": 270, "fatigue_load_limit_kN": 6.55, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61952 carries bore code 52 = 260 mm. Outside diameter 360 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 260 mm bore the ring mass is significant: heat 61952 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 260 mm bore (50.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61952 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61952 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 46 mm-wide ring of 61952 drags the lip and overheats it.", "The housing bore for the 360 mm OD should be round within IT7; an oval bore pinches the outer ring of 61952 and shows up later as two-point loaded raceway wear.", "The open 61952 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61952-2Z (shields) and 61952-2RSH (contact seals), not suffix-free 61952.", "The 212/270 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61952 bearing?", "a": "A 61952 deep-groove ball bearing has a 260 mm bore, 360 mm outer diameter and 46 mm width (10.236 × 14.173 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61952 need?", "a": "The open 61952 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61952 bore code work?", "a": "The last two digits of 61952 are bore code 52, giving 52 × 5 = 260 mm bore. The 360 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61952 mean?", "a": "A bare 61952 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61952?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61952 — the open (unsealed) execution, 260×360×46 mm per ISO 15. Quoted values: C 212 kN, C0 270 kN, Pu 6.55 kN, limiting speed 2200 r/min, mass 12000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61952." } ], "cross_ref": [ { "equiv_sku": "61952-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 260×360×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61952", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61952-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61952 MA (machined brass cage, open arrangement) is the same-size execution on the 260×360×46 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61956", "brand": "SKF", "manufacturer_designation": "SKF 61956", "series": "61900-series", "type": "deep_groove", "d_mm": 280, "D_mm": 380, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 216, "static_load_kN": 285, "fatigue_load_limit_kN": 6.7, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61956 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 56 by five gives the 280 mm bore; the 380 mm outside diameter and 46 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 280 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 280 mm bore the ring mass is significant: heat 61956 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (50.0 mm section height at 280 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61956 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61956 units.", "Vibration during standstill brinells the raceways of a 280 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61956 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61956-2Z (shields) and 61956-2RSH (contact seals), not suffix-free 61956.", "The 216/285 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61956 bearing?", "a": "A 61956 deep-groove ball bearing has a 280 mm bore, 380 mm outer diameter and 46 mm width (11.024 × 14.961 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61956 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61956 uses the same ISO 15 envelope (280×380×46 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61956 have?", "a": "Unless a clearance suffix says otherwise, 61956 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61956 and verify the residual clearance after mounting." }, { "q": "How should 61956 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 280 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61956?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61956 — the open (unsealed) execution, 280×380×46 mm per ISO 15. Quoted values: C 216 kN, C0 285 kN, Pu 6.7 kN, limiting speed 2000 r/min, mass 12000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61956." } ], "cross_ref": [ { "equiv_sku": "61956-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 280×380×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61956", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61956-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61956 MA (machined brass cage, open arrangement) is the same-size execution on the 280×380×46 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61960", "brand": "SKF", "manufacturer_designation": "SKF 61960", "series": "61900-series", "type": "deep_groove", "d_mm": 300, "D_mm": 420, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 270, "static_load_kN": 375, "fatigue_load_limit_kN": 8.3, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 19000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61960 carries bore code 60 = 300 mm. Outside diameter 420 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 300 mm bore the ring mass is significant: heat 61960 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 300 mm bore (60.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61960 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×420×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61960 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61960-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 300 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61960.", "The open 61960 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61960-2Z (shields) and 61960-2RSH (contact seals), not suffix-free 61960.", "The 270/375 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61960 bearing?", "a": "A 61960 deep-groove ball bearing has a 300 mm bore, 420 mm outer diameter and 56 mm width (11.811 × 16.535 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61960 need?", "a": "The open 61960 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61960 bore code work?", "a": "The last two digits of 61960 are bore code 60, giving 60 × 5 = 300 mm bore. The 420 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61960 mean?", "a": "A bare 61960 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61960?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61960 — the open (unsealed) execution, 300×420×56 mm per ISO 15. Quoted values: C 270 kN, C0 375 kN, Pu 8.3 kN, limiting speed 1900 r/min, mass 19000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61960." } ], "cross_ref": [ { "equiv_sku": "61960-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 300×420×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61960", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61960-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61960 MA (machined brass cage, open arrangement) is the same-size execution on the 300×420×56 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6200-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6200-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 30 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6200-2RSL.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Codes 00–03 are the exception series: 6200 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "At 10 mm bore the 62xx light series is the workhorse section; its 30×9 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6200-RSR run faster than contact-seal 6200-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6200-2RS instead.", "The non-contact lip of 6200-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6200-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-RSR bearing?", "a": "A 6200-RSR deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6200-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6200-RSR need?", "a": "6200-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6200 with a housing grease fitting instead." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6200-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2RSL — two low-friction non-contact elastomer seals, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 28000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6200-RSR." } ], "cross_ref": [ { "equiv_sku": "6200-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7200", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2RS1 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2Z shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6201-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6201-2RSL.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Miniature bearings like 6201-RSR (12 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6201-RSR run faster than contact-seal 6201-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6201-2RS instead.", "The low-drag lip of 6201-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Measure the shaft, do not trust the drawing: a 12 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6201-RSR.", "SKF catalogues the low-friction seal as 6201-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-RSR bearing?", "a": "A 6201-RSR deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6201-RSR have?", "a": "Unless a clearance suffix says otherwise, 6201-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6201 and verify the residual clearance after mounting." }, { "q": "How should 6201-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6201-RSR need?", "a": "6201-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6201 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6201-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2RSL — two low-friction non-contact elastomer seals, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 26000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6201-RSR." } ], "cross_ref": [ { "equiv_sku": "6201-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7201", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2RS1 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2Z shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6202-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 46, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6202-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6202-2RSL.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Miniature bearings like 6202-RSR (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6202-RSR run faster than contact-seal 6202-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6202-2RS instead.", "The non-contact lip of 6202-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6202-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6202-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 43000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-RSR bearing?", "a": "A 6202-RSR deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6202-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6202-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2RSL — two low-friction non-contact elastomer seals, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 22000 r/min, mass 46 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6202-RSR." } ], "cross_ref": [ { "equiv_sku": "6202-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7202", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2RS1 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2Z shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6203-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6203-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6203-2RSL.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6203-RSR run faster than contact-seal 6203-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6203-2RS instead.", "The non-contact lip of 6203-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6203-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6203-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-RSR bearing?", "a": "A 6203-RSR deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6203-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6203-RSR need?", "a": "6203-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6203 with a housing grease fitting instead." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6203-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2RSL — two low-friction non-contact elastomer seals, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 19000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6203-RSR." } ], "cross_ref": [ { "equiv_sku": "6203-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7203", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2RS1 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2Z shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6204-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6204-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6204-2RSL.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 20 mm bore the 62xx light series is the workhorse section; its 47×14 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The low-drag lip of 6204-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6204-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6204-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6204-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 17000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-RSR bearing?", "a": "A 6204-RSR deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "Are 6204 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6204 uses the same ISO 15 envelope (20×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6204-RSR have?", "a": "Unless a clearance suffix says otherwise, 6204-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6204 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6204-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2RSL — two low-friction non-contact elastomer seals, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 17000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6204-RSR." } ], "cross_ref": [ { "equiv_sku": "6204-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2RS1 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2Z shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6205-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6205-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6205-2RSL.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "A 25 mm shaft for 6205 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6205-RSR run faster than contact-seal 6205-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6205-2RS instead.", "The low-drag lip of 6205-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Never mix components between two 6205-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 25 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 6205-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 14000 r/min limiting speed, closer to the open bearing's 28000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-RSR bearing?", "a": "A 6205-RSR deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6205-RSR need?", "a": "6205-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6205 with a housing grease fitting instead." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6205-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 6205-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2RSL — two low-friction non-contact elastomer seals, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 14000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6205-RSR." } ], "cross_ref": [ { "equiv_sku": "6205-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2RS1 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2Z shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6206-2RZ", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6206-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 62 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6206-2RZ.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "The low-drag lip of 6206-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6206-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6206-RSR.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6206-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6206-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-RSR bearing?", "a": "A 6206-RSR deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6206-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "Are 6206 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6206 uses the same ISO 15 envelope (30×62×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6206-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2RZ — two low-friction non-contact elastomer seals, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 12000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6206-RSR." } ], "cross_ref": [ { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2RS1 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2Z shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206 shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206-2Z shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6208-2RZ", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6208-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 80 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6208-2RZ.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 40 mm bore the 62xx light series is the workhorse section; its 80×18 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6208-RSR run faster than contact-seal 6208-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6208-2RS instead.", "The low-drag lip of 6208-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 6208-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9000 r/min limiting speed, closer to the open bearing's 18000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-RSR bearing?", "a": "A 6208-RSR deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6208-RSR have?", "a": "Unless a clearance suffix says otherwise, 6208-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6208 and verify the residual clearance after mounting." }, { "q": "How should 6208-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6208-RSR need?", "a": "6208-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6208 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6208-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2RZ — two low-friction non-contact elastomer seals, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 9000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6208-RSR." } ], "cross_ref": [ { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2RS1 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2Z shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208 shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208-2Z shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224", "brand": "SKF", "manufacturer_designation": "SKF 6224", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 5250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6224 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 215 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 120 mm of 6224 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "The open 6224 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×215×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6224 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 40 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6224 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6224-2Z (shields) and 6224-2RSH (contact seals), not suffix-free 6224.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224 bearing?", "a": "A 6224 deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6224 mean?", "a": "A bare 6224 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "Are 6224 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6224 uses the same ISO 15 envelope (120×215×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6224?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224 — the open (unsealed) execution, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 4000 r/min, mass 5250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6224 M (machined brass cage, open arrangement) is the same-size execution on the 120×215×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6224-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 5350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6224-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 215 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6224-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 120 mm of 6224-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6224-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6224-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6224-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6224-2RS.", "SKF catalogues the contact-sealed version as 6224-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1900 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6300 r/min thermal reference speed. The single-seal catalogue number is 6224-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6224-RS1 exists for arrangements that lubricate through the open side; fitting 6224-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224-2RS bearing?", "a": "A 6224-2RS deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "Are 6224 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6224 uses the same ISO 15 envelope (120×215×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6224-2RS have?", "a": "Unless a clearance suffix says otherwise, 6224-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6224 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6224-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 1900 r/min, mass 5350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224-2RS." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6224 M (machined brass cage, open arrangement) is the same-size execution on the 120×215×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6224-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 5350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6224-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 215 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6224-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 120 mm of 6224-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6224-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6224-2RS for that.", "Do not wash 6224-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6224-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 120 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6224-ZZ.", "SKF spells the shielded version 6224-2Z (one shield: 6224-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6224-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6224-2Z for high-contamination positions.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224-ZZ bearing?", "a": "A 6224-ZZ deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6224-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "Are 6224 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6224 uses the same ISO 15 envelope (120×215×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6224-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224-2Z — two non-contact sheet-metal shields, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 3200 r/min, mass 5350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224-ZZ." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6224 M (machined brass cage, open arrangement) is the same-size execution on the 120×215×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226", "brand": "SKF", "manufacturer_designation": "SKF 6226", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6226 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×230×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6226 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6226-C3. No clearance suffix means normal CN clearance.", "The open 6226 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6226-2Z (shields) and 6226-2RSH (contact seals), not suffix-free 6226.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226 bearing?", "a": "A 6226 deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6226 bore code work?", "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6226 mean?", "a": "A bare 6226 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 130 mm bore?", "a": "The '2' is the light diameter series: 230×40 mm with a 50.0 mm radial section at 130 mm bore. A 6326 on the same bore is larger and higher-rated; a 6026 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6226?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226 — the open (unsealed) execution, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 3600 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6226 M (machined brass cage, open arrangement) is the same-size execution on the 130×230×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6226-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 6000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6226-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 230 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6226-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Heat is the enemy of the sealed 6226-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6226-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 40 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Measure the shaft, do not trust the drawing: a 130 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6226-2RS.", "SKF catalogues the contact-sealed version as 6226-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6226-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6226-RS1 exists for arrangements that lubricate through the open side; fitting 6226-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226-2RS bearing?", "a": "A 6226-2RS deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6226-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6226-2RS need?", "a": "6226-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6226 with a housing grease fitting instead." }, { "q": "How does the 6226 bore code work?", "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6226-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 1800 r/min, mass 6000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226-2RS." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6226 M (machined brass cage, open arrangement) is the same-size execution on the 130×230×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6226-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 6000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6226-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 230 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6226-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 130 mm of 6226-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6226-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6226-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6226-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6226-2Z (one shield: 6226-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6226-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6226-2Z for high-contamination positions.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226-ZZ bearing?", "a": "A 6226-ZZ deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6226 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6226 uses the same ISO 15 envelope (130×230×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6226-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6226-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6226 and verify the residual clearance after mounting." }, { "q": "How should 6226-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6226-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226-2Z — two non-contact sheet-metal shields, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 3000 r/min, mass 6000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226-ZZ." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6226 M (machined brass cage, open arrangement) is the same-size execution on the 130×230×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6228", "brand": "SKF", "manufacturer_designation": "SKF 6228", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 165, "static_load_kN": 150, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 7750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6228 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 250 mm outside diameter and 42 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 6228 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 140 mm bore the 62xx light series is the workhorse section; its 250×42 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6228 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×250×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6228 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 42 mm-wide ring of 6228 drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6228-C3. No clearance suffix means normal CN clearance.", "The open 6228 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6228-2Z (shields) and 6228-2RSH (contact seals), not suffix-free 6228.", "The 165/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6228 bearing?", "a": "A 6228 deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 140 mm bore?", "a": "The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated." }, { "q": "Are 6228 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6228 uses the same ISO 15 envelope (140×250×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6228 have?", "a": "Unless a clearance suffix says otherwise, 6228 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6228 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6228?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6228 — the open (unsealed) execution, 140×250×42 mm per ISO 15. Quoted values: C 165 kN, C0 150 kN, Pu 4.55 kN, limiting speed 3400 r/min, mass 7750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6228." } ], "cross_ref": [ { "equiv_sku": "6228-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6228-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6228-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6228-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6228-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6228-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6228-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 6228 MA (machined brass cage, open arrangement) is the same-size execution on the 140×250×42 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6230", "brand": "SKF", "manufacturer_designation": "SKF 6230", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 174, "static_load_kN": 166, "fatigue_load_limit_kN": 4.9, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 10000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 150 mm bore the 62xx light series is the workhorse section; its 270×45 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6230 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6230 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6230 drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6230-C3. No clearance suffix means normal CN clearance.", "The open 6230 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6230-2Z (shields) and 6230-2RSH (contact seals), not suffix-free 6230.", "The 174/166 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6230 bearing?", "a": "A 6230 deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "Are 6230 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6230 uses the same ISO 15 envelope (150×270×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6230 have?", "a": "Unless a clearance suffix says otherwise, 6230 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6230 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6230?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6230 — the open (unsealed) execution, 150×270×45 mm per ISO 15. Quoted values: C 174 kN, C0 166 kN, Pu 4.9 kN, limiting speed 3200 r/min, mass 10000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6230." } ], "cross_ref": [ { "equiv_sku": "6230-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6230-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6230-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6230-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6230-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6230 M (machined brass cage, open arrangement) is the same-size execution on the 150×270×45 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6232", "brand": "SKF", "manufacturer_designation": "SKF 6232", "series": "6200-series", "type": "deep_groove", "d_mm": 160, "D_mm": 290, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 186, "static_load_kN": 186, "fatigue_load_limit_kN": 5.3, "reference_speed_rpm": 4500, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 13000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6232 carries bore code 32 = 160 mm. Outside diameter 290 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 160 mm of 6232 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 160 mm bore; before upgrading to a 6332 for extra capacity, confirm the housing accepts a 290 mm OD and 48 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6232 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6232 units.", "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6232.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6232 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6232-2Z (shields) and 6232-2RSH (contact seals), not suffix-free 6232.", "The 186/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6232 bearing?", "a": "A 6232 deep-groove ball bearing has a 160 mm bore, 290 mm outer diameter and 48 mm width (6.299 × 11.417 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6232 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6232 uses the same ISO 15 envelope (160×290×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6232 have?", "a": "Unless a clearance suffix says otherwise, 6232 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6232 and verify the residual clearance after mounting." }, { "q": "How should 6232 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6232?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6232 — the open (unsealed) execution, 160×290×48 mm per ISO 15. Quoted values: C 186 kN, C0 186 kN, Pu 5.3 kN, limiting speed 3000 r/min, mass 13000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6232." } ], "cross_ref": [ { "equiv_sku": "6232-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6232-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×290×48 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6232-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6232", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6232-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6232 M (machined brass cage, open arrangement) is the same-size execution on the 160×290×48 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6234", "brand": "SKF", "manufacturer_designation": "SKF 6234", "series": "6200-series", "type": "deep_groove", "d_mm": 170, "D_mm": 310, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 212, "static_load_kN": 224, "fatigue_load_limit_kN": 6.1, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6234 carries bore code 34 = 170 mm. Outside diameter 310 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 170 mm of 6234 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 170 mm bore the 62xx light series is the workhorse section; its 310×52 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6234 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×310×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6234 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 310 mm OD should be round within IT7; an oval bore pinches the outer ring of 6234 and shows up later as two-point loaded raceway wear.", "The open 6234 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6234-2Z (shields) and 6234-2RSH (contact seals), not suffix-free 6234.", "The 212/224 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6234 bearing?", "a": "A 6234 deep-groove ball bearing has a 170 mm bore, 310 mm outer diameter and 52 mm width (6.693 × 12.205 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 170 mm bore?", "a": "The '2' is the light diameter series: 310×52 mm with a 70.0 mm radial section at 170 mm bore. A 6334 on the same bore is larger and higher-rated; a 6034 is smaller and lower-rated." }, { "q": "Are 6234 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6234 uses the same ISO 15 envelope (170×310×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6234 have?", "a": "Unless a clearance suffix says otherwise, 6234 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6234 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6234?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6234 — the open (unsealed) execution, 170×310×52 mm per ISO 15. Quoted values: C 212 kN, C0 224 kN, Pu 6.1 kN, limiting speed 2800 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6234." } ], "cross_ref": [ { "equiv_sku": "6234-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6234-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×310×52 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6234-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6234", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6234-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6234 M (machined brass cage, open arrangement) is the same-size execution on the 170×310×52 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6236", "brand": "SKF", "manufacturer_designation": "SKF 6236", "series": "6200-series", "type": "deep_groove", "d_mm": 180, "D_mm": 320, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 240, "fatigue_load_limit_kN": 6.4, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6236 carries bore code 36 = 180 mm. Outside diameter 320 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 180 mm bore; before upgrading to a 6336 for extra capacity, confirm the housing accepts a 320 mm OD and 52 mm width — it is not a drop-in swap.", "The open 6236 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×320×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6236 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 52 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6236 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6236-2Z (shields) and 6236-2RSH (contact seals), not suffix-free 6236.", "The 229/240 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6236 bearing?", "a": "A 6236 deep-groove ball bearing has a 180 mm bore, 320 mm outer diameter and 52 mm width (7.087 × 12.598 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6236 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6236 need?", "a": "The open 6236 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6236 bore code work?", "a": "The last two digits of 6236 are bore code 36, giving 36 × 5 = 180 mm bore. The 320 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6236?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6236 — the open (unsealed) execution, 180×320×52 mm per ISO 15. Quoted values: C 229 kN, C0 240 kN, Pu 6.4 kN, limiting speed 2600 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6236." } ], "cross_ref": [ { "equiv_sku": "6236-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6236-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×320×52 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6236-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6236", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6236-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6236 M (machined brass cage, open arrangement) is the same-size execution on the 180×320×52 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6238", "brand": "SKF", "manufacturer_designation": "SKF 6238", "series": "6200-series", "type": "deep_groove", "d_mm": 190, "D_mm": 340, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 255, "static_load_kN": 280, "fatigue_load_limit_kN": 7.35, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 19500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6238 carries bore code 38 = 190 mm. Outside diameter 340 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 190 mm bore; before upgrading to a 6338 for extra capacity, confirm the housing accepts a 340 mm OD and 55 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6238 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6238 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 340 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6238.", "The housing bore for the 340 mm OD should be round within IT7; an oval bore pinches the outer ring of 6238 and shows up later as two-point loaded raceway wear.", "The open 6238 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6238-2Z (shields) and 6238-2RSH (contact seals), not suffix-free 6238.", "The 255/280 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6238 bearing?", "a": "A 6238 deep-groove ball bearing has a 190 mm bore, 340 mm outer diameter and 55 mm width (7.48 × 13.386 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6238 need?", "a": "The open 6238 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6238 bore code work?", "a": "The last two digits of 6238 are bore code 38, giving 38 × 5 = 190 mm bore. The 340 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6238 mean?", "a": "A bare 6238 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6238?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6238 — the open (unsealed) execution, 190×340×55 mm per ISO 15. Quoted values: C 255 kN, C0 280 kN, Pu 7.35 kN, limiting speed 2400 r/min, mass 19500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6238." } ], "cross_ref": [ { "equiv_sku": "6238-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6238-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×340×55 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6238-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6238", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6238-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6238 M (machined brass cage, open arrangement) is the same-size execution on the 190×340×55 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6240", "brand": "SKF", "manufacturer_designation": "SKF 6240", "series": "6200-series", "type": "deep_groove", "d_mm": 200, "D_mm": 360, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 270, "static_load_kN": 310, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 23500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6240 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 40 by five gives the 200 mm bore; the 360 mm outside diameter and 58 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 200 mm of 6240 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 200 mm bore; before upgrading to a 6340 for extra capacity, confirm the housing accepts a 360 mm OD and 58 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6240 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6240 units.", "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6240 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6240-2Z (shields) and 6240-2RSH (contact seals), not suffix-free 6240.", "The 270/310 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6240 bearing?", "a": "A 6240 deep-groove ball bearing has a 200 mm bore, 360 mm outer diameter and 58 mm width (7.874 × 14.173 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6240 have?", "a": "Unless a clearance suffix says otherwise, 6240 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6240 and verify the residual clearance after mounting." }, { "q": "How should 6240 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6240 need?", "a": "The open 6240 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6240?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6240 — the open (unsealed) execution, 200×360×58 mm per ISO 15. Quoted values: C 270 kN, C0 310 kN, Pu 7.8 kN, limiting speed 2200 r/min, mass 23500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6240." } ], "cross_ref": [ { "equiv_sku": "6240-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6240-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×360×58 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6240-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6240", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6240-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6240 M (machined brass cage, open arrangement) is the same-size execution on the 200×360×58 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6244", "brand": "SKF", "manufacturer_designation": "SKF 6244", "series": "6200-series", "type": "deep_groove", "d_mm": 220, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 296, "static_load_kN": 365, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 33500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6244 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 44 by five gives the 220 mm bore; the 400 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 220 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 220 mm bore the ring mass is significant: heat 6244 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 220 mm bore; before upgrading to a 6344 for extra capacity, confirm the housing accepts a 400 mm OD and 65 mm width — it is not a drop-in swap.", "The open 6244 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×400×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6244 units.", "Never mix components between two 6244 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6244 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6244-2Z (shields) and 6244-2RSH (contact seals), not suffix-free 6244.", "The 296/365 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6244 bearing?", "a": "A 6244 deep-groove ball bearing has a 220 mm bore, 400 mm outer diameter and 65 mm width (8.661 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6244 bore code work?", "a": "The last two digits of 6244 are bore code 44, giving 44 × 5 = 220 mm bore. The 400 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6244 mean?", "a": "A bare 6244 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 220 mm bore?", "a": "The '2' is the light diameter series: 400×65 mm with a 90.0 mm radial section at 220 mm bore. A 6344 on the same bore is larger and higher-rated; a 6044 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6244?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6244 — the open (unsealed) execution, 220×400×65 mm per ISO 15. Quoted values: C 296 kN, C0 365 kN, Pu 8.8 kN, limiting speed 2000 r/min, mass 33500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6244." } ], "cross_ref": [ { "equiv_sku": "6244-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6244-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6244", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6244-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6244 M (machined brass cage, open arrangement) is the same-size execution on the 220×400×65 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6300-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 53, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6300-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6300-2RSL.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium section at 10 mm bore gains dynamic rating through larger rolling elements on a 35 mm OD; the penalty is mass and a lower limiting speed than the 6200 — do not specify it for speed-critical shafts.", "RSR low-friction seals on 6300-RSR run faster than contact-seal 6300-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6300-2RS instead.", "The low-drag lip of 6300-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Shaft and housing fillets must clear the bearing chamfer so the 11 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6300-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-RSR bearing?", "a": "A 6300-RSR deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6300-RSR have?", "a": "Unless a clearance suffix says otherwise, 6300-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6300 and verify the residual clearance after mounting." }, { "q": "How should 6300-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6300-RSR need?", "a": "6300-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6300 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6300-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2RSL — two low-friction non-contact elastomer seals, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 26000 r/min, mass 53 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6300-RSR." } ], "cross_ref": [ { "equiv_sku": "6300-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2RS1 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2Z shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6301-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 60, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6301-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 37 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6301-2RSL.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Miniature bearings like 6301-RSR (12 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "RSR low-friction seals on 6301-RSR run faster than contact-seal 6301-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6301-2RS instead.", "The low-drag lip of 6301-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 6301-RSR drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 12 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6301-RSR.", "SKF catalogues the low-friction seal as 6301-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-RSR bearing?", "a": "A 6301-RSR deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6301 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6301 uses the same ISO 15 envelope (12×37×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6301-RSR have?", "a": "Unless a clearance suffix says otherwise, 6301-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6301 and verify the residual clearance after mounting." }, { "q": "How should 6301-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6301-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2RSL — two low-friction non-contact elastomer seals, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 22000 r/min, mass 60 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6301-RSR." } ], "cross_ref": [ { "equiv_sku": "6301-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7301", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2RS1 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2Z shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6302-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 85, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6302-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 42 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6302-2RSL.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Codes 00–03 are the exception series: 6302 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "RSR low-friction seals on 6302-RSR run faster than contact-seal 6302-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6302-2RS instead.", "The non-contact lip of 6302-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 6302-RSR and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6302-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-RSR bearing?", "a": "A 6302-RSR deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6302-RSR have?", "a": "Unless a clearance suffix says otherwise, 6302-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6302 and verify the residual clearance after mounting." }, { "q": "How should 6302-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6302-RSR need?", "a": "6302-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6302 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6302-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2RSL — two low-friction non-contact elastomer seals, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 19000 r/min, mass 85 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6302-RSR." } ], "cross_ref": [ { "equiv_sku": "6302-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7302", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2RS1 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2Z shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6303-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6303-2RSL.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Miniature bearings like 6303-RSR (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium section at 17 mm bore gains dynamic rating through larger rolling elements on a 47 mm OD; the penalty is mass and a lower limiting speed than the 6203 — do not specify it for speed-critical shafts.", "RSR low-friction seals on 6303-RSR run faster than contact-seal 6303-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6303-2RS instead.", "The non-contact lip of 6303-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6303-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6303-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 17000 r/min limiting speed, closer to the open bearing's 34000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303-RSR bearing?", "a": "A 6303-RSR deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6303-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 17 mm bore?", "a": "The '3' is the medium diameter series: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 6203 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6303-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303-2RSL — two low-friction non-contact elastomer seals, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 17000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6303-RSR." } ], "cross_ref": [ { "equiv_sku": "6303-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "7303", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6303-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2RS1 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2Z shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6303-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6304-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 15.9, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6304-2RSL.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 20 mm shaft for 6304 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.", "RSR low-friction seals on 6304-RSR run faster than contact-seal 6304-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6304-2RS instead.", "The non-contact lip of 6304-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 15 mm-wide ring of 6304-RSR drags the lip and overheats it.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6304-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 15.9/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-RSR bearing?", "a": "A 6304-RSR deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6304 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6304 uses the same ISO 15 envelope (20×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6304-RSR have?", "a": "Unless a clearance suffix says otherwise, 6304-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6304 and verify the residual clearance after mounting." }, { "q": "How should 6304-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6304-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2RSL — two low-friction non-contact elastomer seals, 20×52×15 mm per ISO 15. Quoted values: C 15.9 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6304-RSR." } ], "cross_ref": [ { "equiv_sku": "6304-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2RS1 shares the 20×52×15 mm envelope but rates differently (15.9/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2Z shares the 20×52×15 mm envelope but rates differently (15.9/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304 shares the 20×52×15 mm envelope but rates differently (15.9/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6305-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6305-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6305-2RZ.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6305-RSR.", "The 63xx medium section at 25 mm bore gains dynamic rating through larger rolling elements on a 62 mm OD; the penalty is mass and a lower limiting speed than the 6205 — do not specify it for speed-critical shafts.", "The low-drag lip of 6305-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6305-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6305-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-RSR bearing?", "a": "A 6305-RSR deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6305-RSR need?", "a": "6305-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6305 with a housing grease fitting instead." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6305-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 6305-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2RZ — two low-friction non-contact elastomer seals, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 13000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6305-RSR." } ], "cross_ref": [ { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2RS1 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2Z shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305 shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305-2Z shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6306-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6306-2RZ.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6306-RSR.", "The 63xx medium series gains rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier rolling elements also trade away some speed versus a 6206.", "RSR low-friction seals on 6306-RSR run faster than contact-seal 6306-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6306-2RS instead.", "The low-drag lip of 6306-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6306-C3. No clearance suffix means normal CN clearance.", "Never mix components between two 6306-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the low-friction seal as 6306-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-RSR bearing?", "a": "A 6306-RSR deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6306-RSR need?", "a": "6306-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6306 with a housing grease fitting instead." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6306-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 6306-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2RZ — two low-friction non-contact elastomer seals, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 11000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6306-RSR." } ], "cross_ref": [ { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2RS1 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2Z shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306 shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306-2Z shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6308-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6308-2RZ.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "The low-drag lip of 6308-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6308-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6308-RSR drags the lip and overheats it.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6308-RSR.", "SKF catalogues the low-friction seal as 6308-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-RSR bearing?", "a": "A 6308-RSR deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6308-RSR have?", "a": "Unless a clearance suffix says otherwise, 6308-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6308 and verify the residual clearance after mounting." }, { "q": "How should 6308-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6308-RSR need?", "a": "6308-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6308 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6308-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2RZ — two low-friction non-contact elastomer seals, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 8500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6308-RSR." } ], "cross_ref": [ { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308 shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308-2Z shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324", "brand": "SKF", "manufacturer_designation": "SKF 6324", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 120 mm of 6324 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "Storage matters for open bearings: 6324 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6324 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 260 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6324.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6324 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6324-2Z (shields) and 6324-2RSH (contact seals), not suffix-free 6324.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324 bearing?", "a": "A 6324 deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6324 bore code work?", "a": "The last two digits of 6324 are bore code 24, giving 24 × 5 = 120 mm bore. The 260 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6324 mean?", "a": "A bare 6324 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6324?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324 — the open (unsealed) execution, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 3400 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6324-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6324-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6324 M (machined brass cage, open arrangement) is the same-size execution on the 120×260×55 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6324-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6324-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "Heat is the enemy of the sealed 6324-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6324-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 260 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6324-2RS.", "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6324-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6324-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6324-RS1 exists for arrangements that lubricate through the open side; fitting 6324-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324-2RS bearing?", "a": "A 6324-2RS deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6324-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6324 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6324 uses the same ISO 15 envelope (120×260×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6324-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 1700 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324-2RS." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6324-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6324-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6324 M (machined brass cage, open arrangement) is the same-size execution on the 120×260×55 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6324-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6324-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 5600, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6324-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 260 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6324-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "ZZ shields are non-contact: 6324-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6324-2RS for that.", "Shielded 6324-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6324-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6324-2Z (one shield: 6324-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6324-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6324-2Z for high-contamination positions.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324-ZZ bearing?", "a": "A 6324-ZZ deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6324-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6324 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6324 uses the same ISO 15 envelope (120×260×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6324-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324-2Z — two non-contact sheet-metal shields, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 2800 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324-ZZ." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6324-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6324-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6324 M (machined brass cage, open arrangement) is the same-size execution on the 120×260×55 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6324-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6326", "brand": "SKF", "manufacturer_designation": "SKF 6326", "series": "6300-series", "type": "deep_groove", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 216, "fatigue_load_limit_kN": 6.3, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 15000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6326 carries bore code 26 = 130 mm. Outside diameter 280 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 6326 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 130 mm bore through a 280 mm OD and 58 mm width; the heavier rolling elements also trade away some speed versus a 6226.", "The open 6326 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×280×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6326 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6326-C3. No clearance suffix means normal CN clearance.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6326 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6326-2Z (shields) and 6326-2RSH (contact seals), not suffix-free 6326.", "The 229/216 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6326 bearing?", "a": "A 6326 deep-groove ball bearing has a 130 mm bore, 280 mm outer diameter and 58 mm width (5.118 × 11.024 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6326 need?", "a": "The open 6326 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6326 bore code work?", "a": "The last two digits of 6326 are bore code 26, giving 26 × 5 = 130 mm bore. The 280 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6326 mean?", "a": "A bare 6326 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6326?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6326 — the open (unsealed) execution, 130×280×58 mm per ISO 15. Quoted values: C 229 kN, C0 216 kN, Pu 6.3 kN, limiting speed 3200 r/min, mass 15000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6326." } ], "cross_ref": [ { "equiv_sku": "6326-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6326-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6326-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6326-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6326", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6326-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6326 M (machined brass cage, open arrangement) is the same-size execution on the 130×280×58 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6328", "brand": "SKF", "manufacturer_designation": "SKF 6328", "series": "6300-series", "type": "deep_groove", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 251, "static_load_kN": 245, "fatigue_load_limit_kN": 7.1, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 18500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6328 carries bore code 28 = 140 mm. Outside diameter 300 mm and width 62 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium section at 140 mm bore gains dynamic rating through larger rolling elements on a 300 mm OD; the penalty is mass and a lower limiting speed than the 6228 — do not specify it for speed-critical shafts.", "The open 6328 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×300×62 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6328 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 300 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6328.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6328-C3. No clearance suffix means normal CN clearance.", "The open 6328 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6328-2Z (shields) and 6328-2RSH (contact seals), not suffix-free 6328.", "The 251/245 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6328 bearing?", "a": "A 6328 deep-groove ball bearing has a 140 mm bore, 300 mm outer diameter and 62 mm width (5.512 × 11.811 × 2.441 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6328 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6328 uses the same ISO 15 envelope (140×300×62 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6328 have?", "a": "Unless a clearance suffix says otherwise, 6328 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6328 and verify the residual clearance after mounting." }, { "q": "How should 6328 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6328?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6328 — the open (unsealed) execution, 140×300×62 mm per ISO 15. Quoted values: C 251 kN, C0 245 kN, Pu 7.1 kN, limiting speed 3000 r/min, mass 18500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6328." } ], "cross_ref": [ { "equiv_sku": "6328-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6328-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6328-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6328", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6328-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6328 M (machined brass cage, open arrangement) is the same-size execution on the 140×300×62 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6330", "brand": "SKF", "manufacturer_designation": "SKF 6330", "series": "6300-series", "type": "deep_groove", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 276, "static_load_kN": 285, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 23000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6330 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 320 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 6330 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 150 mm bore gains dynamic rating through larger rolling elements on a 320 mm OD; the penalty is mass and a lower limiting speed than the 6230 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6330 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6330 units.", "The housing bore for the 320 mm OD should be round within IT7; an oval bore pinches the outer ring of 6330 and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6330 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6330-2Z (shields) and 6330-2RSH (contact seals), not suffix-free 6330.", "The 276/285 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6330 bearing?", "a": "A 6330 deep-groove ball bearing has a 150 mm bore, 320 mm outer diameter and 65 mm width (5.906 × 12.598 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6330 bore code work?", "a": "The last two digits of 6330 are bore code 30, giving 30 × 5 = 150 mm bore. The 320 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6330 mean?", "a": "A bare 6330 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 150 mm bore?", "a": "The '3' is the medium diameter series: 320×65 mm, 85.0 mm radial section at 150 mm bore, carrying more load than a 6230 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6330?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6330 — the open (unsealed) execution, 150×320×65 mm per ISO 15. Quoted values: C 276 kN, C0 285 kN, Pu 7.8 kN, limiting speed 2800 r/min, mass 23000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6330." } ], "cross_ref": [ { "equiv_sku": "6330-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6330-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×320×65 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6330-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6330-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6330 M (machined brass cage, open arrangement) is the same-size execution on the 150×320×65 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6334", "brand": "SKF", "manufacturer_designation": "SKF 6334", "series": "6300-series", "type": "deep_groove", "d_mm": 170, "D_mm": 360, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 312, "static_load_kN": 340, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 31000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6334 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 360 mm outside diameter and 72 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 170 mm of 6334 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 170 mm bore through a 360 mm OD and 72 mm width; the heavier rolling elements also trade away some speed versus a 6234.", "The open 6334 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×360×72 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6334 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6334 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6334-2Z (shields) and 6334-2RSH (contact seals), not suffix-free 6334.", "The 312/340 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6334 bearing?", "a": "A 6334 deep-groove ball bearing has a 170 mm bore, 360 mm outer diameter and 72 mm width (6.693 × 14.173 × 2.835 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6334 need?", "a": "The open 6334 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6334 bore code work?", "a": "The last two digits of 6334 are bore code 34, giving 34 × 5 = 170 mm bore. The 360 mm outside diameter and 72 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6334 mean?", "a": "A bare 6334 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6334?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6334 — the open (unsealed) execution, 170×360×72 mm per ISO 15. Quoted values: C 312 kN, C0 340 kN, Pu 8.8 kN, limiting speed 2400 r/min, mass 31000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6334." } ], "cross_ref": [ { "equiv_sku": "6334-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×360×72 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6334-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×360×72 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6334", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6334-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6334 M (machined brass cage, open arrangement) is the same-size execution on the 170×360×72 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6336", "brand": "SKF", "manufacturer_designation": "SKF 6336", "series": "6300-series", "type": "deep_groove", "d_mm": 180, "D_mm": 380, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 351, "static_load_kN": 405, "fatigue_load_limit_kN": 10.4, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 36500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6336 carries bore code 36 = 180 mm. Outside diameter 380 mm and width 75 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 180 mm bore the ring mass is significant: heat 6336 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 180 mm bore through a 380 mm OD and 75 mm width; the heavier rolling elements also trade away some speed versus a 6236.", "The open 6336 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×380×75 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6336 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6336-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 180 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6336.", "The open 6336 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6336-2Z (shields) and 6336-2RSH (contact seals), not suffix-free 6336.", "The 351/405 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6336 bearing?", "a": "A 6336 deep-groove ball bearing has a 180 mm bore, 380 mm outer diameter and 75 mm width (7.087 × 14.961 × 2.953 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6336 mean?", "a": "A bare 6336 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 180 mm bore?", "a": "The '3' is the medium diameter series: 380×75 mm, 100.0 mm radial section at 180 mm bore, carrying more load than a 6236 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6336 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6336 uses the same ISO 15 envelope (180×380×75 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6336?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6336 — the open (unsealed) execution, 180×380×75 mm per ISO 15. Quoted values: C 351 kN, C0 405 kN, Pu 10.4 kN, limiting speed 2200 r/min, mass 36500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6336." } ], "cross_ref": [ { "equiv_sku": "6336-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6336-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6336", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6336-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6336 M (machined brass cage, open arrangement) is the same-size execution on the 180×380×75 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6338", "brand": "SKF", "manufacturer_designation": "SKF 6338", "series": "6300-series", "type": "deep_groove", "d_mm": 190, "D_mm": 400, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 371, "static_load_kN": 430, "fatigue_load_limit_kN": 10.8, "reference_speed_rpm": 3400, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 42000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6338 carries bore code 38 = 190 mm. Outside diameter 400 mm and width 78 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 190 mm of 6338 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 190 mm bore gains dynamic rating through larger rolling elements on a 400 mm OD; the penalty is mass and a lower limiting speed than the 6238 — do not specify it for speed-critical shafts.", "The open 6338 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×400×78 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6338 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 190 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6338 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6338-2Z (shields) and 6338-2RSH (contact seals), not suffix-free 6338.", "The 371/430 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6338 bearing?", "a": "A 6338 deep-groove ball bearing has a 190 mm bore, 400 mm outer diameter and 78 mm width (7.48 × 15.748 × 3.071 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6338 need?", "a": "The open 6338 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6338 bore code work?", "a": "The last two digits of 6338 are bore code 38, giving 38 × 5 = 190 mm bore. The 400 mm outside diameter and 78 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6338 mean?", "a": "A bare 6338 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6338?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6338 — the open (unsealed) execution, 190×400×78 mm per ISO 15. Quoted values: C 371 kN, C0 430 kN, Pu 10.8 kN, limiting speed 2200 r/min, mass 42000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6338." } ], "cross_ref": [ { "equiv_sku": "6338-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6338-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6338", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6338-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6338 M (machined brass cage, open arrangement) is the same-size execution on the 190×400×78 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6403", "brand": "SKF", "manufacturer_designation": "SKF 6403", "series": "6400-series", "type": "deep_groove", "d_mm": 17, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.455, "reference_speed_rpm": 28000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6403 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Codes 00–03 are the exception series: 6403 takes its 17 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 64xx heavy section at 17 mm bore (62 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6403 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×62×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6403 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6403-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6403.", "The open 6403 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6403-2Z (shields) and 6403-2RSH (contact seals), not suffix-free 6403.", "The 22.9/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6403 bearing?", "a": "A 6403 deep-groove ball bearing has a 17 mm bore, 62 mm outer diameter and 17 mm width (0.669 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6403 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6403 uses the same ISO 15 envelope (17×62×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6403 have?", "a": "Unless a clearance suffix says otherwise, 6403 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6403 and verify the residual clearance after mounting." }, { "q": "How should 6403 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6403?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6403 — the open (unsealed) execution, 17×62×17 mm per ISO 15. Quoted values: C 22.9 kN, C0 10.8 kN, Pu 0.455 kN, limiting speed 18000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6403." } ], "cross_ref": [ { "equiv_sku": "6403-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6403-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6403-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6403-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6415", "brand": "SKF", "manufacturer_designation": "SKF 6415", "series": "6400-series", "type": "deep_groove", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 153, "static_load_kN": 114, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 5800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6415 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 190 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.", "The 64xx heavy section at 75 mm bore exists for high radial load at moderate rpm; its 190 mm OD and 45 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "The open 6415 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×190×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6415 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 190 mm OD should be round within IT7; an oval bore pinches the outer ring of 6415 and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6415.", "The open 6415 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6415-2Z (shields) and 6415-2RSH (contact seals), not suffix-free 6415.", "The 153/114 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6415 bearing?", "a": "A 6415 deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6415 mean?", "a": "A bare 6415 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 75 mm bore?", "a": "The '4' is the heavy diameter series: 190×45 mm, 57.5 mm radial section at 75 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6415 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6415 uses the same ISO 15 envelope (75×190×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6415?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6415 — the open (unsealed) execution, 75×190×45 mm per ISO 15. Quoted values: C 153 kN, C0 114 kN, Pu 4.15 kN, limiting speed 5000 r/min, mass 5800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6415." } ], "cross_ref": [ { "equiv_sku": "6415-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6415-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6415-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6416", "brand": "SKF", "manufacturer_designation": "SKF 6416", "series": "6400-series", "type": "deep_groove", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 163, "static_load_kN": 125, "fatigue_load_limit_kN": 4.5, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 6850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6416 carries bore code 16 = 80 mm. Outside diameter 200 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 80 mm bore (200 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6416 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6416 units.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6416.", "The open 6416 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6416-2Z (shields) and 6416-2RSH (contact seals), not suffix-free 6416.", "The 163/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6416 bearing?", "a": "A 6416 deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6416 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6416 uses the same ISO 15 envelope (80×200×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6416 have?", "a": "Unless a clearance suffix says otherwise, 6416 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6416 and verify the residual clearance after mounting." }, { "q": "How should 6416 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6416?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6416 — the open (unsealed) execution, 80×200×48 mm per ISO 15. Quoted values: C 163 kN, C0 125 kN, Pu 4.5 kN, limiting speed 4800 r/min, mass 6850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6416." } ], "cross_ref": [ { "equiv_sku": "6416-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6416-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6416-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6417", "brand": "SKF", "manufacturer_designation": "SKF 6417", "series": "6400-series", "type": "deep_groove", "d_mm": 85, "D_mm": 210, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 174, "static_load_kN": 137, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 8050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6417 carries bore code 17 = 85 mm. Outside diameter 210 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 85 mm bore exists for high radial load at moderate rpm; its 210 mm OD and 52 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "The open 6417 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×210×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6417 units.", "Shaft and housing fillets must clear the bearing chamfer so the 52 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6400-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6417 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6417-2Z (shields) and 6417-2RSH (contact seals), not suffix-free 6417.", "The 174/137 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6417 bearing?", "a": "A 6417 deep-groove ball bearing has a 85 mm bore, 210 mm outer diameter and 52 mm width (3.346 × 8.268 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6417 mean?", "a": "A bare 6417 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 85 mm bore?", "a": "The '4' is the heavy diameter series: 210×52 mm, 62.5 mm radial section at 85 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6417 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6417 uses the same ISO 15 envelope (85×210×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6417?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6417 — the open (unsealed) execution, 85×210×52 mm per ISO 15. Quoted values: C 174 kN, C0 137 kN, Pu 4.75 kN, limiting speed 4500 r/min, mass 8050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6417." } ], "cross_ref": [ { "equiv_sku": "6417-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6417-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6418", "brand": "SKF", "manufacturer_designation": "SKF 6418", "series": "6400-series", "type": "deep_groove", "d_mm": 90, "D_mm": 225, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 186, "static_load_kN": 150, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 9800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6418 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 225 mm outside diameter and 54 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 90 mm of 6418 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 64xx heavy section at 90 mm bore (225 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6418 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6418 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 54 mm-wide ring of 6418 drags the lip and overheats it.", "The housing bore for the 225 mm OD should be round within IT7; an oval bore pinches the outer ring of 6418 and shows up later as two-point loaded raceway wear.", "The open 6418 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6418-2Z (shields) and 6418-2RSH (contact seals), not suffix-free 6418.", "The 186/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6418 bearing?", "a": "A 6418 deep-groove ball bearing has a 90 mm bore, 225 mm outer diameter and 54 mm width (3.543 × 8.858 × 2.126 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6418 mean?", "a": "A bare 6418 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 90 mm bore?", "a": "The '4' is the heavy diameter series: 225×54 mm, 67.5 mm radial section at 90 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6418 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6418 uses the same ISO 15 envelope (90×225×54 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6418?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6418 — the open (unsealed) execution, 90×225×54 mm per ISO 15. Quoted values: C 186 kN, C0 150 kN, Pu 5 kN, limiting speed 4300 r/min, mass 9800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6418." } ], "cross_ref": [ { "equiv_sku": "6418-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6418-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "618-7", "brand": "SKF", "manufacturer_designation": "618/7", "series": "61800-series", "type": "deep_groove", "d_mm": 7, "D_mm": 14, "B_mm": 3.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.78, "static_load_kN": 0.26, "fatigue_load_limit_kN": 0.011, "reference_speed_rpm": 100000, "limiting_speed_rpm": 63000, "max_rpm": 63000, "weight_g": 2.2, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 61800-series, the bore is written directly after the slash as 7 mm (bores below 10 mm use the slash spelling). The envelope is 7×14×3.5 mm (0.276×0.551×0.138 in) with a 3.5 mm radial section height, C 0.78 kN, C0 0.26 kN and Pu 0.011 kN. The open 618/7 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 63000 r/min, catalogue mass 2.2 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 14 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 618-7.", "Mount by heating the inner ring (max 120 °C) — driving 618-7 home through the outer ring or balls brinells the raceways.", "Open 618-7 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-7; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 618/7-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "At 7 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Where two 618/7 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 618-7?", "a": "The SKF 618/7 measures 7 mm bore × 14 mm OD × 3.5 mm width (0.276 × 0.551 × 0.138 in), mass about 2.2 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/7?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/7 means 7 mm bore. The site slug 618-7 replaces the slash with a hyphen." }, { "q": "What is the speed rating of 618-7?", "a": "SKF lists a 100000 r/min thermal reference speed and a 63000 r/min mechanical limiting speed for 618/7; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-7 and a same-bore 62-series bearing?", "a": "Section height differs: 618-7 has a 3.5 mm radial section and C 0.78 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 618-7?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 14 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "W618-7", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×14×3.5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.78/0.26 kN vs 0.663/0.26 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "618-7", "618/7" ], "locale_variants": {} }, { "sku": "628-7-ZZ", "brand": "SKF", "manufacturer_designation": "628/7-2Z", "series": "62800-series", "type": "deep_groove", "d_mm": 7, "D_mm": 14, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.956, "static_load_kN": 0.4, "fatigue_load_limit_kN": 0.017, "reference_speed_rpm": 100000, "limiting_speed_rpm": 50000, "max_rpm": 50000, "weight_g": 3.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 62800-series, the bore is written directly after the slash as 7 mm (bores below 10 mm use the slash spelling). The envelope is 7×14×5 mm (0.276×0.551×0.197 in) with a 3.5 mm radial section height, C 0.956 kN, C0 0.4 kN and Pu 0.017 kN. SKF spells the double shield 628/7-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 50000 r/min, catalogue mass 3.1 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "small fans and blowers", "hand-held power tools", "domestic appliances", "instrument and encoder drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Fillet radii must clear the 628-7-ZZ chamfer so the 5 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The fatigue load limit is 0.017 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Shields on 628-7-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 628/7-2RS for washdown duty.", "Do not pry the caps off 628-7-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Mount by heating the inner ring (max 120 °C) — driving 628-7-ZZ home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.017 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 628/7 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 628/7 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 628-7-ZZ?", "a": "The SKF 628/7-2Z measures 7 mm bore × 14 mm OD × 5 mm width (0.276 × 0.551 × 0.197 in), mass about 3.1 g. It has two non-contact sheet-metal shields." }, { "q": "Why is there a slash in the designation 628/7-2Z?", "a": "The slash writes a bore that falls outside the two-digit code table: 628/7 means 7 mm bore. The site slug 628-7-ZZ replaces the slash with a hyphen." }, { "q": "How long can a greased 628-7-ZZ be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 628-7-ZZ take?", "a": "Catalogue values for 628/7-2Z: dynamic C 0.956 kN, static C0 0.4 kN, fatigue limit Pu 0.017 kN. Use C in life calculation and C0 for static checks at 7 mm bore." }, { "q": "What is the speed rating of 628-7-ZZ?", "a": "SKF lists a 100000 r/min thermal reference speed and a 50000 r/min mechanical limiting speed for 628/7-2Z; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "W628-7-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×14×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.956/0.4 kN vs 0.663/0.26 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "628-7-ZZ", "628/7-2Z" ], "locale_variants": {} }, { "sku": "619-7-ZZ", "brand": "SKF", "manufacturer_designation": "619/7-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 7, "D_mm": 17, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.06, "static_load_kN": 0.375, "fatigue_load_limit_kN": 0.016, "reference_speed_rpm": 90000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 4.9, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 61900-series, the bore is written directly after the slash as 7 mm (bores below 10 mm use the slash spelling). The envelope is 7×17×5 mm (0.276×0.669×0.197 in) with a 5.0 mm radial section height, C 1.06 kN, C0 0.375 kN and Pu 0.016 kN. SKF spells the double shield 619/7-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 45000 r/min, catalogue mass 4.9 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "compressor drives", "machine tool auxiliaries", "agricultural gearboxes", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "At 7 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Clearance suffixes follow the seal code in the designation stack (e.g. 619/7-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Shields on 619-7-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 619/7-2RS for washdown duty.", "Do not pry the caps off 619-7-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Assign interference to the rotating ring: on a conventional shaft-mounted 7 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Deep-groove geometry tolerates only minutes of misalignment; if the 17 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 619-7-ZZ.", "Where two 619/7 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 619-7-ZZ?", "a": "The SKF 619/7-2Z measures 7 mm bore × 17 mm OD × 5 mm width (0.276 × 0.669 × 0.197 in), mass about 4.9 g. It has two non-contact sheet-metal shields." }, { "q": "Why is there a slash in the designation 619/7-2Z?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/7 means 7 mm bore. The site slug 619-7-ZZ replaces the slash with a hyphen." }, { "q": "How heavy is 619-7-ZZ?", "a": "Catalogue mass is 4.9 g for 619/7-2Z; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 619-7-ZZ have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 619-7-ZZ be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "619-7", "equiv_brand": "SKF", "level": "full", "note": "Same 7×17×5 mm envelope and equivalent catalogue ratings; 619/7 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W619-7-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.06/0.375 kN vs 0.923/0.365 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-7", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.06/0.375 kN vs 0.923/0.365 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "619-7-ZZ", "619/7-2Z" ], "locale_variants": {} }, { "sku": "619-7", "brand": "SKF", "manufacturer_designation": "619/7", "series": "61900-series", "type": "deep_groove", "d_mm": 7, "D_mm": 17, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.06, "static_load_kN": 0.375, "fatigue_load_limit_kN": 0.016, "reference_speed_rpm": 90000, "limiting_speed_rpm": 56000, "max_rpm": 56000, "weight_g": 4.9, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 61900-series, the bore is written directly after the slash as 7 mm (bores below 10 mm use the slash spelling). The envelope is 7×17×5 mm (0.276×0.669×0.197 in) with a 5.0 mm radial section height, C 1.06 kN, C0 0.375 kN and Pu 0.016 kN. The open 619/7 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 56000 r/min, catalogue mass 4.9 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "industrial electric motors", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 17 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 619-7.", "Do not preload 619-7 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Open 619-7 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-7; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 619-7 home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.016 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 619/7 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 619-7?", "a": "The SKF 619/7 measures 7 mm bore × 17 mm OD × 5 mm width (0.276 × 0.669 × 0.197 in), mass about 4.9 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/7?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/7 means 7 mm bore. The site slug 619-7 replaces the slash with a hyphen." }, { "q": "What internal clearance does 619-7 have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 619-7 be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 619-7 take?", "a": "Catalogue values for 619/7: dynamic C 1.06 kN, static C0 0.375 kN, fatigue limit Pu 0.016 kN. Use C in life calculation and C0 for static checks at 7 mm bore." } ], "cross_ref": [ { "equiv_sku": "619-7-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×17×5 mm envelope and equivalent catalogue ratings; 619/7-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W619-7-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.06/0.375 kN vs 0.923/0.365 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-7", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.06/0.375 kN vs 0.923/0.365 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "619-7", "619/7" ], "locale_variants": {} }, { "sku": "607", "brand": "SKF", "manufacturer_designation": "607", "series": "6000-series", "type": "deep_groove", "d_mm": 7, "D_mm": 19, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.34, "static_load_kN": 0.95, "fatigue_load_limit_kN": 0.04, "reference_speed_rpm": 85000, "limiting_speed_rpm": 53000, "max_rpm": 53000, "weight_g": 7.6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 607 fits a 7 mm shaft (direct-number miniature spelling). The envelope is 7×19×6 mm (0.276×0.748×0.236 in) with a 6.0 mm radial section height, C 2.34 kN, C0 0.95 kN and Pu 0.04 kN. The open 607 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 53000 r/min, catalogue mass 7.6 g.", "applications": [ "model-making and hobby mechanics", "small pumps", "office equipment", "fractional-horsepower motors" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "At 7 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Assign interference to the rotating ring: on a conventional shaft-mounted 7 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Open 607 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 607; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 607 chamfer so the 6 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Assign interference to the rotating ring: on a conventional shaft-mounted 7 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 607 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 607?", "a": "The SKF 607 measures 7 mm bore × 19 mm OD × 6 mm width (0.276 × 0.748 × 0.236 in), mass about 7.6 g. It is open, with no shields or seals." }, { "q": "How do I read the 607 designation?", "a": "Small miniature bearings print the bore as the final digit, so 607 is a 7 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What is the speed rating of 607?", "a": "SKF lists a 85000 r/min thermal reference speed and a 53000 r/min mechanical limiting speed for 607; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 607 and a same-bore 62-series bearing?", "a": "Section height differs: 607 has a 6 mm radial section and C 2.34 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 607?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 19 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "607-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "607-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "607-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W607-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W607-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W607", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "607", "607" ], "locale_variants": {} }, { "sku": "607-2RS", "brand": "SKF", "manufacturer_designation": "607-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 7, "D_mm": 19, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.34, "static_load_kN": 0.95, "fatigue_load_limit_kN": 0.04, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 7.8, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 607 fits a 7 mm shaft (direct-number miniature spelling). The envelope is 7×19×6 mm (0.276×0.748×0.236 in) with a 6.0 mm radial section height, C 2.34 kN, C0 0.95 kN and Pu 0.04 kN. SKF catalogues the sealed execution as 607-2RSH: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 24000 r/min, catalogue mass 7.8 g.", "applications": [ "model-making and hobby mechanics", "small pumps", "office equipment", "fractional-horsepower motors" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 19 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 607-2RS.", "Catalogue ratings for 607-2RS (C 2.34 kN, C0 0.95 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Contact seals make 607-2RS slower than the open 607 (limiting 24000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 607-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Assign interference to the rotating ring: on a conventional shaft-mounted 7 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Deep-groove geometry tolerates only minutes of misalignment; if the 19 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 607-2RS.", "Where two 607 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 607-2RS?", "a": "The SKF 607-2RSH measures 7 mm bore × 19 mm OD × 6 mm width (0.276 × 0.748 × 0.236 in), mass about 7.8 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How do I read the 607 designation?", "a": "Small miniature bearings print the bore as the final digit, so 607 is a 7 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "Which fits should I use for 607-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 19 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 607-2RS?", "a": "Catalogue mass is 7.8 g for 607-2RSH; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 607-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "607", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "607-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "607-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W607-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W607-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W607", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "607-2RS", "607-2RSH" ], "locale_variants": {} }, { "sku": "607-RSR", "brand": "SKF", "manufacturer_designation": "607-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 7, "D_mm": 19, "B_mm": 6, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.34, "static_load_kN": 0.95, "fatigue_load_limit_kN": 0.04, "reference_speed_rpm": 85000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 7.8, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 607 fits a 7 mm shaft (direct-number miniature spelling). The envelope is 7×19×6 mm (0.276×0.748×0.236 in) with a 6.0 mm radial section height, C 2.34 kN, C0 0.95 kN and Pu 0.04 kN. SKF lists this as 607-2RSL with a low-friction non-contact seal (2RSL/2RZ spelling): it runs near open-bearing speed with less drag than a contact seal but is not liquid-tight. Limiting speed 43000 r/min, catalogue mass 7.8 g.", "applications": [ "office equipment", "fractional-horsepower motors", "small fans and blowers", "hand-held power tools" ], "failure_modes": [ "fine dust or moisture passing the low-friction non-contact lip in dirty or wet duty", "grease loss past the low-drag seal when no regreasing schedule is kept", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 7 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Clearance suffixes follow the seal code in the designation stack (e.g. 607-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The low-friction seal on 607-RSR saves drag versus a contact lip but is not liquid-tight; wet or chemically aggressive positions need the 2RS version.", "Do not pry the caps off 607-RSR to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Assign interference to the rotating ring: on a conventional shaft-mounted 7 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Deep-groove geometry tolerates only minutes of misalignment; if the 19 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 607-RSR.", "Where two 607 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 607-RSR?", "a": "The SKF 607-2RSL measures 7 mm bore × 19 mm OD × 6 mm width (0.276 × 0.748 × 0.236 in), mass about 7.8 g. It has two low-friction non-contact rubber seals." }, { "q": "How do I read the 607 designation?", "a": "Small miniature bearings print the bore as the final digit, so 607 is a 7 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "Which fits should I use for 607-RSR?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 19 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 607-RSR?", "a": "Catalogue mass is 7.8 g for 607-2RSL; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 607-RSR have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "607", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "607-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "607-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W607-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W607-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W607", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "607-RSR", "607-2RSL" ], "locale_variants": {} }, { "sku": "607-ZZ", "brand": "SKF", "manufacturer_designation": "607-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 7, "D_mm": 19, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.34, "static_load_kN": 0.95, "fatigue_load_limit_kN": 0.04, "reference_speed_rpm": 85000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 8.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 607 fits a 7 mm shaft (direct-number miniature spelling). The envelope is 7×19×6 mm (0.276×0.748×0.236 in) with a 6.0 mm radial section height, C 2.34 kN, C0 0.95 kN and Pu 0.04 kN. SKF spells the double shield 607-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 43000 r/min, catalogue mass 8.4 g.", "applications": [ "instrument and encoder drives", "model-making and hobby mechanics", "small pumps", "office equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Fillet radii must clear the 607-ZZ chamfer so the 6 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "At 7 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Shields on 607-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 607-2RS for washdown duty.", "Do not pry the caps off 607-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Catalogue ratings for 607-ZZ (C 2.34 kN, C0 0.95 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 607-ZZ home through the outer ring or balls brinells the raceways.", "A replacement 607 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 607-ZZ?", "a": "The SKF 607-2Z measures 7 mm bore × 19 mm OD × 6 mm width (0.276 × 0.748 × 0.236 in), mass about 8.4 g. It has two non-contact sheet-metal shields." }, { "q": "How do I read the 607 designation?", "a": "Small miniature bearings print the bore as the final digit, so 607 is a 7 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What is the speed rating of 607-ZZ?", "a": "SKF lists a 85000 r/min thermal reference speed and a 43000 r/min mechanical limiting speed for 607-2Z; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 607-ZZ and a same-bore 62-series bearing?", "a": "Section height differs: 607-ZZ has a 6 mm radial section and C 2.34 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 607-ZZ?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 19 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "607", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "607-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "607-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; 607-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W607-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W607-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W607", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.53/0.585 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "607-ZZ", "607-2Z" ], "locale_variants": {} }, { "sku": "627", "brand": "SKF", "manufacturer_designation": "627", "series": "6200-series", "type": "deep_groove", "d_mm": 7, "D_mm": 22, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.45, "static_load_kN": 1.37, "fatigue_load_limit_kN": 0.057, "reference_speed_rpm": 70000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 12, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the final digit is the bore in millimetres: 627 fits a 7 mm shaft (direct-number miniature spelling). The envelope is 7×22×7 mm (0.276×0.866×0.276 in) with a 7.5 mm radial section height, C 3.45 kN, C0 1.37 kN and Pu 0.057 kN. The open 627 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 45000 r/min, catalogue mass 12 g.", "applications": [ "domestic appliances", "instrument and encoder drives", "model-making and hobby mechanics", "small pumps" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 7 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 627 (C 3.45 kN, C0 1.37 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Open 627 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 627; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 627-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "At 7 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Where two 627 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 627?", "a": "The SKF 627 measures 7 mm bore × 22 mm OD × 7 mm width (0.276 × 0.866 × 0.276 in), mass about 12 g. It is open, with no shields or seals." }, { "q": "How do I read the 627 designation?", "a": "Small miniature bearings print the bore as the final digit, so 627 is a 7 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "Which fits should I use for 627?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 22 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 627?", "a": "Catalogue mass is 12 g for 627; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 627 have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "627-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "627-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "627-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W627-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W627-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W627", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "627", "627" ], "locale_variants": {} }, { "sku": "627-2RS", "brand": "SKF", "manufacturer_designation": "627-2RSH", "series": "6200-series", "type": "deep_groove", "d_mm": 7, "D_mm": 22, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.45, "static_load_kN": 1.37, "fatigue_load_limit_kN": 0.057, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 13, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the final digit is the bore in millimetres: 627 fits a 7 mm shaft (direct-number miniature spelling). The envelope is 7×22×7 mm (0.276×0.866×0.276 in) with a 7.5 mm radial section height, C 3.45 kN, C0 1.37 kN and Pu 0.057 kN. SKF catalogues the sealed execution as 627-2RSH: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 22000 r/min, catalogue mass 13 g.", "applications": [ "office equipment", "fractional-horsepower motors", "small fans and blowers", "hand-held power tools" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 627-2RS home through the outer ring or balls brinells the raceways.", "At 7 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Contact seals make 627-2RS slower than the open 627 (limiting 22000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 627-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Deep-groove geometry tolerates only minutes of misalignment; if the 22 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 627-2RS.", "Do not preload 627-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 627 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 627-2RS?", "a": "The SKF 627-2RSH measures 7 mm bore × 22 mm OD × 7 mm width (0.276 × 0.866 × 0.276 in), mass about 13 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How do I read the 627 designation?", "a": "Small miniature bearings print the bore as the final digit, so 627 is a 7 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What is the speed rating of 627-2RS?", "a": "SKF publishes only the 22000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 627-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 627-2RS has a 7.5 mm radial section and C 3.45 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 627-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 22 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "627", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "627-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "627-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W627-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W627-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W627", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "627-2RS", "627-2RSH" ], "locale_variants": {} }, { "sku": "627-RSR", "brand": "SKF", "manufacturer_designation": "627-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 7, "D_mm": 22, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.45, "static_load_kN": 1.37, "fatigue_load_limit_kN": 0.057, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 13, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the final digit is the bore in millimetres: 627 fits a 7 mm shaft (direct-number miniature spelling). The envelope is 7×22×7 mm (0.276×0.866×0.276 in) with a 7.5 mm radial section height, C 3.45 kN, C0 1.37 kN and Pu 0.057 kN. SKF lists this as 627-2RSL with a low-friction non-contact seal (2RSL/2RZ spelling): it runs near open-bearing speed with less drag than a contact seal but is not liquid-tight. Limiting speed 36000 r/min, catalogue mass 13 g.", "applications": [ "small fans and blowers", "hand-held power tools", "domestic appliances", "instrument and encoder drives" ], "failure_modes": [ "fine dust or moisture passing the low-friction non-contact lip in dirty or wet duty", "grease loss past the low-drag seal when no regreasing schedule is kept", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Fillet radii must clear the 627-RSR chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The fatigue load limit is 0.057 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The low-friction seal on 627-RSR saves drag versus a contact lip but is not liquid-tight; wet or chemically aggressive positions need the 2RS version.", "Do not pry the caps off 627-RSR to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 627-RSR to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 627-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "For positions that need relubrication, choose the open execution of 627 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 627-RSR?", "a": "The SKF 627-2RSL measures 7 mm bore × 22 mm OD × 7 mm width (0.276 × 0.866 × 0.276 in), mass about 13 g. It has two low-friction non-contact rubber seals." }, { "q": "How do I read the 627 designation?", "a": "Small miniature bearings print the bore as the final digit, so 627 is a 7 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What internal clearance does 627-RSR have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 627-RSR be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 627-RSR take?", "a": "Catalogue values for 627-2RSL: dynamic C 3.45 kN, static C0 1.37 kN, fatigue limit Pu 0.057 kN. Use C in life calculation and C0 for static checks at 7 mm bore." } ], "cross_ref": [ { "equiv_sku": "627", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "627-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "627-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W627-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W627-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W627", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "627-RSR", "627-2RSL" ], "locale_variants": {} }, { "sku": "627-ZZ", "brand": "SKF", "manufacturer_designation": "627-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 7, "D_mm": 22, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.45, "static_load_kN": 1.37, "fatigue_load_limit_kN": 0.057, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 13, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the final digit is the bore in millimetres: 627 fits a 7 mm shaft (direct-number miniature spelling). The envelope is 7×22×7 mm (0.276×0.866×0.276 in) with a 7.5 mm radial section height, C 3.45 kN, C0 1.37 kN and Pu 0.057 kN. SKF spells the double shield 627-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 36000 r/min, catalogue mass 13 g.", "applications": [ "small pumps", "office equipment", "fractional-horsepower motors", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 627-ZZ home through the outer ring or balls brinells the raceways.", "Do not preload 627-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Shields on 627-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 627-2RS for washdown duty.", "Do not pry the caps off 627-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Catalogue ratings for 627-ZZ (C 3.45 kN, C0 1.37 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 627-ZZ home through the outer ring or balls brinells the raceways.", "A replacement 627 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 627 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 627-ZZ?", "a": "The SKF 627-2Z measures 7 mm bore × 22 mm OD × 7 mm width (0.276 × 0.866 × 0.276 in), mass about 13 g. It has two non-contact sheet-metal shields." }, { "q": "How do I read the 627 designation?", "a": "Small miniature bearings print the bore as the final digit, so 627 is a 7 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "Which fits should I use for 627-ZZ?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 22 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 627-ZZ?", "a": "Catalogue mass is 13 g for 627-2Z; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 627-ZZ have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "627", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "627-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "627-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; 627-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W627-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W627-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W627", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "627-ZZ", "627-2Z" ], "locale_variants": {} }, { "sku": "618-8", "brand": "SKF", "manufacturer_designation": "618/8", "series": "61800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 16, "B_mm": 4, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.819, "static_load_kN": 0.3, "fatigue_load_limit_kN": 0.012, "reference_speed_rpm": 90000, "limiting_speed_rpm": 56000, "max_rpm": 56000, "weight_g": 3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 61800-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). The envelope is 8×16×4 mm (0.315×0.63×0.157 in) with a 4.0 mm radial section height, C 0.819 kN, C0 0.3 kN and Pu 0.012 kN. The open 618/8 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 56000 r/min, catalogue mass 3 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "industrial fans", "compressor drives", "machine tool auxiliaries", "agricultural gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Fillet radii must clear the 618-8 chamfer so the 4 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Mount by heating the inner ring (max 120 °C) — driving 618-8 home through the outer ring or balls brinells the raceways.", "Open 618-8 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-8; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 618-8 home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.012 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 618-8?", "a": "The SKF 618/8 measures 8 mm bore × 16 mm OD × 4 mm width (0.315 × 0.63 × 0.157 in), mass about 3 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/8?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/8 means 8 mm bore. The site slug 618-8 replaces the slash with a hyphen." }, { "q": "What load can 618-8 take?", "a": "Catalogue values for 618/8: dynamic C 0.819 kN, static C0 0.3 kN, fatigue limit Pu 0.012 kN. Use C in life calculation and C0 for static checks at 8 mm bore." }, { "q": "What is the speed rating of 618-8?", "a": "SKF lists a 90000 r/min thermal reference speed and a 56000 r/min mechanical limiting speed for 618/8; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-8 and a same-bore 62-series bearing?", "a": "Section height differs: 618-8 has a 4 mm radial section and C 0.819 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "W618-8", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×4 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.819/0.3 kN vs 0.715/0.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "618-8", "618/8" ], "locale_variants": {} }, { "sku": "628-8-2RS", "brand": "SKF", "manufacturer_designation": "628/8-2RS1", "series": "62800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 16, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.33, "static_load_kN": 0.57, "fatigue_load_limit_kN": 0.024, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 3.6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 62800-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). The envelope is 8×16×5 mm (0.315×0.63×0.197 in) with a 4.0 mm radial section height, C 1.33 kN, C0 0.57 kN and Pu 0.024 kN. SKF catalogues the sealed execution as 628/8-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 26000 r/min, catalogue mass 3.6 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "domestic appliances", "instrument and encoder drives", "model-making and hobby mechanics", "small pumps" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "The fatigue load limit is 0.024 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Do not preload 628-8-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Contact seals make 628-8-2RS slower than the open 628/8 (limiting 26000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 628-8-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Deep-groove geometry tolerates only minutes of misalignment; if the 16 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 628-8-2RS.", "Do not preload 628-8-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 628/8 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Where two 628/8 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 628-8-2RS?", "a": "The SKF 628/8-2RS1 measures 8 mm bore × 16 mm OD × 5 mm width (0.315 × 0.63 × 0.197 in), mass about 3.6 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "Why is there a slash in the designation 628/8-2RS1?", "a": "The slash writes a bore that falls outside the two-digit code table: 628/8 means 8 mm bore. The site slug 628-8-2RS replaces the slash with a hyphen." }, { "q": "How long can a greased 628-8-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 628-8-2RS take?", "a": "Catalogue values for 628/8-2RS1: dynamic C 1.33 kN, static C0 0.57 kN, fatigue limit Pu 0.024 kN. Use C in life calculation and C0 for static checks at 8 mm bore." }, { "q": "What is the speed rating of 628-8-2RS?", "a": "SKF publishes only the 26000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." } ], "cross_ref": [ { "equiv_sku": "628-8-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×16×5 mm envelope and equivalent catalogue ratings; 628/8-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W628-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.33/0.57 kN vs 0.715/0.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W628-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.33/0.57 kN vs 0.715/0.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "628-8-2RS", "628/8-2RS1" ], "locale_variants": {} }, { "sku": "628-8-ZZ", "brand": "SKF", "manufacturer_designation": "628/8-2Z", "series": "62800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 16, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.33, "static_load_kN": 0.57, "fatigue_load_limit_kN": 0.024, "reference_speed_rpm": 90000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 3.6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 62800-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). The envelope is 8×16×5 mm (0.315×0.63×0.197 in) with a 4.0 mm radial section height, C 1.33 kN, C0 0.57 kN and Pu 0.024 kN. SKF spells the double shield 628/8-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 45000 r/min, catalogue mass 3.6 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "hand-held power tools", "domestic appliances", "instrument and encoder drives", "model-making and hobby mechanics" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 8 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Mount by heating the inner ring (max 120 °C) — driving 628-8-ZZ home through the outer ring or balls brinells the raceways.", "Shields on 628-8-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 628/8-2RS for washdown duty.", "Do not pry the caps off 628-8-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Fillet radii must clear the 628-8-ZZ chamfer so the 5 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Assign interference to the rotating ring: on a conventional shaft-mounted 8 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "A replacement 628/8 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 628-8-ZZ?", "a": "The SKF 628/8-2Z measures 8 mm bore × 16 mm OD × 5 mm width (0.315 × 0.63 × 0.197 in), mass about 3.6 g. It has two non-contact sheet-metal shields." }, { "q": "Why is there a slash in the designation 628/8-2Z?", "a": "The slash writes a bore that falls outside the two-digit code table: 628/8 means 8 mm bore. The site slug 628-8-ZZ replaces the slash with a hyphen." }, { "q": "What internal clearance does 628-8-ZZ have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 628-8-ZZ be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 628-8-ZZ take?", "a": "Catalogue values for 628/8-2Z: dynamic C 1.33 kN, static C0 0.57 kN, fatigue limit Pu 0.024 kN. Use C in life calculation and C0 for static checks at 8 mm bore." } ], "cross_ref": [ { "equiv_sku": "628-8-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×16×5 mm envelope and equivalent catalogue ratings; 628/8-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W628-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.33/0.57 kN vs 0.715/0.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W628-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.33/0.57 kN vs 0.715/0.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "628-8-ZZ", "628/8-2Z" ], "locale_variants": {} }, { "sku": "638-8-ZZ", "brand": "SKF", "manufacturer_designation": "638/8-2Z", "series": "63800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 16, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.33, "static_load_kN": 0.57, "fatigue_load_limit_kN": 0.024, "reference_speed_rpm": 90000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 4.3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 63800-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). The envelope is 8×16×6 mm (0.315×0.63×0.236 in) with a 4.0 mm radial section height, C 1.33 kN, C0 0.57 kN and Pu 0.024 kN. SKF spells the double shield 638/8-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 45000 r/min, catalogue mass 4.3 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "small fans and blowers", "hand-held power tools", "domestic appliances", "instrument and encoder drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 638/8-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Fillet radii must clear the 638-8-ZZ chamfer so the 6 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Shields on 638-8-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 638/8-2RS for washdown duty.", "Do not pry the caps off 638-8-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "At 8 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 638-8-ZZ (C 1.33 kN, C0 0.57 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "For positions that need relubrication, choose the open execution of 638/8 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 638-8-ZZ?", "a": "The SKF 638/8-2Z measures 8 mm bore × 16 mm OD × 6 mm width (0.315 × 0.63 × 0.236 in), mass about 4.3 g. It has two non-contact sheet-metal shields." }, { "q": "Why is there a slash in the designation 638/8-2Z?", "a": "The slash writes a bore that falls outside the two-digit code table: 638/8 means 8 mm bore. The site slug 638-8-ZZ replaces the slash with a hyphen." }, { "q": "What is the speed rating of 638-8-ZZ?", "a": "SKF lists a 90000 r/min thermal reference speed and a 45000 r/min mechanical limiting speed for 638/8-2Z; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 638-8-ZZ and a same-bore 62-series bearing?", "a": "Section height differs: 638-8-ZZ has a 4 mm radial section and C 1.33 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 638-8-ZZ?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 16 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "W638-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.33/0.57 kN vs 0.715/0.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "638-8-ZZ", "638/8-2Z" ], "locale_variants": {} }, { "sku": "619-8-2RS", "brand": "SKF", "manufacturer_designation": "619/8-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 8, "D_mm": 19, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.46, "static_load_kN": 0.465, "fatigue_load_limit_kN": 0.02, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 7.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 61900-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). The envelope is 8×19×6 mm (0.315×0.748×0.236 in) with a 5.5 mm radial section height, C 1.46 kN, C0 0.465 kN and Pu 0.02 kN. SKF catalogues the sealed execution as 619/8-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 24000 r/min, catalogue mass 7.1 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives", "industrial electric motors" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Do not preload 619-8-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Catalogue ratings for 619-8-2RS (C 1.46 kN, C0 0.465 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Contact seals make 619-8-2RS slower than the open 619/8 (limiting 24000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 619-8-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Clearance suffixes follow the seal code in the designation stack (e.g. 619/8-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "At 8 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Where two 619/8 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 619/8 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 619-8-2RS?", "a": "The SKF 619/8-2RS1 measures 8 mm bore × 19 mm OD × 6 mm width (0.315 × 0.748 × 0.236 in), mass about 7.1 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "Why is there a slash in the designation 619/8-2RS1?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/8 means 8 mm bore. The site slug 619-8-2RS replaces the slash with a hyphen." }, { "q": "What load can 619-8-2RS take?", "a": "Catalogue values for 619/8-2RS1: dynamic C 1.46 kN, static C0 0.465 kN, fatigue limit Pu 0.02 kN. Use C in life calculation and C0 for static checks at 8 mm bore." }, { "q": "What is the speed rating of 619-8-2RS?", "a": "SKF publishes only the 24000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 619-8-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 619-8-2RS has a 5.5 mm radial section and C 1.46 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "619-8-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; 619/8-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "619-8", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; 619/8 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "607-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope as SKF 607/8-2Z, but catalogue C/C0 differ (1.46/0.465 kN vs 2.34/0.95 kN) — envelope match only after a load check." }, { "equiv_sku": "W619-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.46/0.465 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.46/0.465 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-8", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.46/0.465 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "619-8-2RS", "619/8-2RS1" ], "locale_variants": {} }, { "sku": "619-8-ZZ", "brand": "SKF", "manufacturer_designation": "619/8-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 8, "D_mm": 19, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.46, "static_load_kN": 0.465, "fatigue_load_limit_kN": 0.02, "reference_speed_rpm": 85000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 7.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 61900-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). The envelope is 8×19×6 mm (0.315×0.748×0.236 in) with a 5.5 mm radial section height, C 1.46 kN, C0 0.465 kN and Pu 0.02 kN. SKF spells the double shield 619/8-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 43000 r/min, catalogue mass 7.1 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "machine tool auxiliaries", "agricultural gearboxes", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 619/8-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Clearance suffixes follow the seal code in the designation stack (e.g. 619/8-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Shields on 619-8-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 619/8-2RS for washdown duty.", "Do not pry the caps off 619-8-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Mount by heating the inner ring (max 120 °C) — driving 619-8-ZZ home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.02 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "A replacement 619/8 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 619-8-ZZ?", "a": "The SKF 619/8-2Z measures 8 mm bore × 19 mm OD × 6 mm width (0.315 × 0.748 × 0.236 in), mass about 7.1 g. It has two non-contact sheet-metal shields." }, { "q": "Why is there a slash in the designation 619/8-2Z?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/8 means 8 mm bore. The site slug 619-8-ZZ replaces the slash with a hyphen." }, { "q": "How long can a greased 619-8-ZZ be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 619-8-ZZ take?", "a": "Catalogue values for 619/8-2Z: dynamic C 1.46 kN, static C0 0.465 kN, fatigue limit Pu 0.02 kN. Use C in life calculation and C0 for static checks at 8 mm bore." }, { "q": "What is the speed rating of 619-8-ZZ?", "a": "SKF lists a 85000 r/min thermal reference speed and a 43000 r/min mechanical limiting speed for 619/8-2Z; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "619-8-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; 619/8-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "619-8", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; 619/8 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "607-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope as SKF 607/8-2Z, but catalogue C/C0 differ (1.46/0.465 kN vs 2.34/0.95 kN) — envelope match only after a load check." }, { "equiv_sku": "W619-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.46/0.465 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.46/0.465 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-8", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.46/0.465 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "619-8-ZZ", "619/8-2Z" ], "locale_variants": {} }, { "sku": "619-8", "brand": "SKF", "manufacturer_designation": "619/8", "series": "61900-series", "type": "deep_groove", "d_mm": 8, "D_mm": 19, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.46, "static_load_kN": 0.465, "fatigue_load_limit_kN": 0.02, "reference_speed_rpm": 85000, "limiting_speed_rpm": 53000, "max_rpm": 53000, "weight_g": 7.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 61900-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). The envelope is 8×19×6 mm (0.315×0.748×0.236 in) with a 5.5 mm radial section height, C 1.46 kN, C0 0.465 kN and Pu 0.02 kN. The open 619/8 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 53000 r/min, catalogue mass 7.1 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "material-handling equipment", "industrial fans", "compressor drives", "machine tool auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 8 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Mount by heating the inner ring (max 120 °C) — driving 619-8 home through the outer ring or balls brinells the raceways.", "Open 619-8 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-8; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 619-8 home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.02 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 619/8 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 619-8?", "a": "The SKF 619/8 measures 8 mm bore × 19 mm OD × 6 mm width (0.315 × 0.748 × 0.236 in), mass about 7.1 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/8?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/8 means 8 mm bore. The site slug 619-8 replaces the slash with a hyphen." }, { "q": "What is the difference between 619-8 and a same-bore 62-series bearing?", "a": "Section height differs: 619-8 has a 5.5 mm radial section and C 1.46 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 619-8?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 19 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 619-8?", "a": "Catalogue mass is 7.1 g for 619/8; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "619-8-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; 619/8-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "619-8-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; 619/8-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "607-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope as SKF 607/8-2Z, but catalogue C/C0 differ (1.46/0.465 kN vs 2.34/0.95 kN) — envelope match only after a load check." }, { "equiv_sku": "W619-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.46/0.465 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.46/0.465 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-8", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.46/0.465 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "619-8", "619/8" ], "locale_variants": {} }, { "sku": "607-8-ZZ", "brand": "SKF", "manufacturer_designation": "607/8-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 8, "D_mm": 19, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.34, "static_load_kN": 0.95, "fatigue_load_limit_kN": 0.04, "reference_speed_rpm": 85000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 7.2, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 6000-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). The envelope is 8×19×6 mm (0.315×0.748×0.236 in) with a 5.5 mm radial section height, C 2.34 kN, C0 0.95 kN and Pu 0.04 kN. SKF spells the double shield 607/8-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 43000 r/min, catalogue mass 7.2 g.", "applications": [ "office equipment", "fractional-horsepower motors", "small fans and blowers", "hand-held power tools" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Do not preload 607-8-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Assign interference to the rotating ring: on a conventional shaft-mounted 8 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Shields on 607-8-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 607/8-2RS for washdown duty.", "Do not pry the caps off 607-8-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "At 8 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 607-8-ZZ (C 2.34 kN, C0 0.95 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "For positions that need relubrication, choose the open execution of 607/8 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 607/8 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 607-8-ZZ?", "a": "The SKF 607/8-2Z measures 8 mm bore × 19 mm OD × 6 mm width (0.315 × 0.748 × 0.236 in), mass about 7.2 g. It has two non-contact sheet-metal shields." }, { "q": "Why is there a slash in the designation 607/8-2Z?", "a": "The slash writes a bore that falls outside the two-digit code table: 607/8 means 8 mm bore. The site slug 607-8-ZZ replaces the slash with a hyphen." }, { "q": "What internal clearance does 607-8-ZZ have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 607-8-ZZ be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 607-8-ZZ take?", "a": "Catalogue values for 607/8-2Z: dynamic C 2.34 kN, static C0 0.95 kN, fatigue limit Pu 0.04 kN. Use C in life calculation and C0 for static checks at 8 mm bore." } ], "cross_ref": [ { "equiv_sku": "619-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope as SKF 619/8-2RS1, but catalogue C/C0 differ (2.34/0.95 kN vs 1.46/0.465 kN) — envelope match only after a load check." }, { "equiv_sku": "619-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope as SKF 619/8-2Z, but catalogue C/C0 differ (2.34/0.95 kN vs 1.46/0.465 kN) — envelope match only after a load check." }, { "equiv_sku": "619-8", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope as SKF 619/8, but catalogue C/C0 differ (2.34/0.95 kN vs 1.46/0.465 kN) — envelope match only after a load check." }, { "equiv_sku": "W619-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-8", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.95 kN vs 1.25/0.455 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "607-8-ZZ", "607/8-2Z" ], "locale_variants": {} }, { "sku": "608", "brand": "SKF", "manufacturer_designation": "608", "series": "6000-series", "type": "deep_groove", "d_mm": 8, "D_mm": 22, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.45, "static_load_kN": 1.37, "fatigue_load_limit_kN": 0.057, "reference_speed_rpm": 75000, "limiting_speed_rpm": 48000, "max_rpm": 48000, "weight_g": 12, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 608 fits a 8 mm shaft (direct-number miniature spelling). The envelope is 8×22×7 mm (0.315×0.866×0.276 in) with a 7.0 mm radial section height, C 3.45 kN, C0 1.37 kN and Pu 0.057 kN. The open 608 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 48000 r/min, catalogue mass 12 g.", "applications": [ "fractional-horsepower motors", "small fans and blowers", "hand-held power tools", "domestic appliances" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Fillet radii must clear the 608 chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Fillet radii must clear the 608 chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Open 608 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 608; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 608-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "At 8 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 608?", "a": "The SKF 608 measures 8 mm bore × 22 mm OD × 7 mm width (0.315 × 0.866 × 0.276 in), mass about 12 g. It is open, with no shields or seals." }, { "q": "How do I read the 608 designation?", "a": "Small miniature bearings print the bore as the final digit, so 608 is a 8 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What internal clearance does 608 have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 608 be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 608 take?", "a": "Catalogue values for 608: dynamic C 3.45 kN, static C0 1.37 kN, fatigue limit Pu 0.057 kN. Use C in life calculation and C0 for static checks at 8 mm bore." } ], "cross_ref": [ { "equiv_sku": "608-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "608-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "608-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W608-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W608-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W608", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "608", "608" ], "locale_variants": {} }, { "sku": "608-2RS", "brand": "SKF", "manufacturer_designation": "608-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 8, "D_mm": 22, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.45, "static_load_kN": 1.37, "fatigue_load_limit_kN": 0.057, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 12, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 608 fits a 8 mm shaft (direct-number miniature spelling). The envelope is 8×22×7 mm (0.315×0.866×0.276 in) with a 7.0 mm radial section height, C 3.45 kN, C0 1.37 kN and Pu 0.057 kN. SKF catalogues the sealed execution as 608-2RSH: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 22000 r/min, catalogue mass 12 g.", "applications": [ "instrument and encoder drives", "model-making and hobby mechanics", "small pumps", "office equipment" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 8 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Assign interference to the rotating ring: on a conventional shaft-mounted 8 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Contact seals make 608-2RS slower than the open 608 (limiting 22000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 608-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "The fatigue load limit is 0.057 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Fillet radii must clear the 608-2RS chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "A replacement 608 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 608-2RS?", "a": "The SKF 608-2RSH measures 8 mm bore × 22 mm OD × 7 mm width (0.315 × 0.866 × 0.276 in), mass about 12 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How do I read the 608 designation?", "a": "Small miniature bearings print the bore as the final digit, so 608 is a 8 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What load can 608-2RS take?", "a": "Catalogue values for 608-2RSH: dynamic C 3.45 kN, static C0 1.37 kN, fatigue limit Pu 0.057 kN. Use C in life calculation and C0 for static checks at 8 mm bore." }, { "q": "What is the speed rating of 608-2RS?", "a": "SKF publishes only the 22000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 608-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 608-2RS has a 7 mm radial section and C 3.45 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "608", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "608-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "608-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W608-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W608-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W608", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "608-2RS", "608-2RSH" ], "locale_variants": {} }, { "sku": "608-RSR", "brand": "SKF", "manufacturer_designation": "608-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 8, "D_mm": 22, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.45, "static_load_kN": 1.37, "fatigue_load_limit_kN": 0.057, "reference_speed_rpm": 75000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 12, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 608 fits a 8 mm shaft (direct-number miniature spelling). The envelope is 8×22×7 mm (0.315×0.866×0.276 in) with a 7.0 mm radial section height, C 3.45 kN, C0 1.37 kN and Pu 0.057 kN. SKF lists this as 608-2RSL with a low-friction non-contact seal (2RSL/2RZ spelling): it runs near open-bearing speed with less drag than a contact seal but is not liquid-tight. Limiting speed 38000 r/min, catalogue mass 12 g.", "applications": [ "hand-held power tools", "domestic appliances", "instrument and encoder drives", "model-making and hobby mechanics" ], "failure_modes": [ "fine dust or moisture passing the low-friction non-contact lip in dirty or wet duty", "grease loss past the low-drag seal when no regreasing schedule is kept", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 608-RSR home through the outer ring or balls brinells the raceways.", "Deep-groove geometry tolerates only minutes of misalignment; if the 22 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 608-RSR.", "The low-friction seal on 608-RSR saves drag versus a contact lip but is not liquid-tight; wet or chemically aggressive positions need the 2RS version.", "Do not pry the caps off 608-RSR to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Assign interference to the rotating ring: on a conventional shaft-mounted 8 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Deep-groove geometry tolerates only minutes of misalignment; if the 22 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 608-RSR.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "A replacement 608 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 608-RSR?", "a": "The SKF 608-2RSL measures 8 mm bore × 22 mm OD × 7 mm width (0.315 × 0.866 × 0.276 in), mass about 12 g. It has two low-friction non-contact rubber seals." }, { "q": "How do I read the 608 designation?", "a": "Small miniature bearings print the bore as the final digit, so 608 is a 8 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What load can 608-RSR take?", "a": "Catalogue values for 608-2RSL: dynamic C 3.45 kN, static C0 1.37 kN, fatigue limit Pu 0.057 kN. Use C in life calculation and C0 for static checks at 8 mm bore." }, { "q": "What is the speed rating of 608-RSR?", "a": "SKF lists a 75000 r/min thermal reference speed and a 38000 r/min mechanical limiting speed for 608-2RSL; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 608-RSR and a same-bore 62-series bearing?", "a": "Section height differs: 608-RSR has a 7 mm radial section and C 3.45 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "608", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "608-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "608-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W608-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W608-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W608", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "608-RSR", "608-2RSL" ], "locale_variants": {} }, { "sku": "608-ZZ", "brand": "SKF", "manufacturer_designation": "608-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 8, "D_mm": 22, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.45, "static_load_kN": 1.37, "fatigue_load_limit_kN": 0.057, "reference_speed_rpm": 75000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 13, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 608 fits a 8 mm shaft (direct-number miniature spelling). The envelope is 8×22×7 mm (0.315×0.866×0.276 in) with a 7.0 mm radial section height, C 3.45 kN, C0 1.37 kN and Pu 0.057 kN. SKF spells the double shield 608-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 38000 r/min, catalogue mass 13 g.", "applications": [ "office equipment", "fractional-horsepower motors", "small fans and blowers", "hand-held power tools" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Do not preload 608-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Mount by heating the inner ring (max 120 °C) — driving 608-ZZ home through the outer ring or balls brinells the raceways.", "Shields on 608-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 608-2RS for washdown duty.", "Do not pry the caps off 608-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 608-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 608-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "For positions that need relubrication, choose the open execution of 608 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 608-ZZ?", "a": "The SKF 608-2Z measures 8 mm bore × 22 mm OD × 7 mm width (0.315 × 0.866 × 0.276 in), mass about 13 g. It has two non-contact sheet-metal shields." }, { "q": "How do I read the 608 designation?", "a": "Small miniature bearings print the bore as the final digit, so 608 is a 8 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What load can 608-ZZ take?", "a": "Catalogue values for 608-2Z: dynamic C 3.45 kN, static C0 1.37 kN, fatigue limit Pu 0.057 kN. Use C in life calculation and C0 for static checks at 8 mm bore." }, { "q": "What is the speed rating of 608-ZZ?", "a": "SKF lists a 75000 r/min thermal reference speed and a 38000 r/min mechanical limiting speed for 608-2Z; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 608-ZZ and a same-bore 62-series bearing?", "a": "Section height differs: 608-ZZ has a 7 mm radial section and C 3.45 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "608", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "608-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "608-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W608-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W608-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W608", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "608-ZZ", "608-2Z" ], "locale_variants": {} }, { "sku": "630-8-2RS", "brand": "SKF", "manufacturer_designation": "630/8-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 8, "D_mm": 22, "B_mm": 11, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.45, "static_load_kN": 1.37, "fatigue_load_limit_kN": 0.057, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 16, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 6300-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). The envelope is 8×22×11 mm (0.315×0.866×0.433 in) with a 7.0 mm radial section height, C 3.45 kN, C0 1.37 kN and Pu 0.057 kN. SKF catalogues the sealed execution as 630/8-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 22000 r/min, catalogue mass 16 g.", "applications": [ "small pumps", "office equipment", "fractional-horsepower motors", "small fans and blowers" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 8 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Fillet radii must clear the 630-8-2RS chamfer so the 11 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Contact seals make 630-8-2RS slower than the open 630/8 (limiting 22000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 630-8-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 630-8-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 630/8-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "A replacement 630/8 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 630/8 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 630-8-2RS?", "a": "The SKF 630/8-2RS1 measures 8 mm bore × 22 mm OD × 11 mm width (0.315 × 0.866 × 0.433 in), mass about 16 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "Why is there a slash in the designation 630/8-2RS1?", "a": "The slash writes a bore that falls outside the two-digit code table: 630/8 means 8 mm bore. The site slug 630-8-2RS replaces the slash with a hyphen." }, { "q": "How heavy is 630-8-2RS?", "a": "Catalogue mass is 16 g for 630/8-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 630-8-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 630-8-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "630-8-2RS", "630/8-2RS1" ], "locale_variants": {} }, { "sku": "628", "brand": "SKF", "manufacturer_designation": "628", "series": "62800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 24, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.9, "static_load_kN": 1.66, "fatigue_load_limit_kN": 0.071, "reference_speed_rpm": 63000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 18, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 62800-series, the final digit is the bore in millimetres: 628 fits a 8 mm shaft (direct-number miniature spelling). The envelope is 8×24×8 mm (0.315×0.945×0.315 in) with a 8.0 mm radial section height, C 3.9 kN, C0 1.66 kN and Pu 0.071 kN. The open 628 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 40000 r/min, catalogue mass 18 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "hand-held power tools", "domestic appliances", "instrument and encoder drives", "model-making and hobby mechanics" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 628 home through the outer ring or balls brinells the raceways.", "Deep-groove geometry tolerates only minutes of misalignment; if the 24 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 628.", "Open 628 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 628; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 24 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 628.", "Do not preload 628 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "A replacement 628 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 628?", "a": "The SKF 628 measures 8 mm bore × 24 mm OD × 8 mm width (0.315 × 0.945 × 0.315 in), mass about 18 g. It is open, with no shields or seals." }, { "q": "How do I read the 628 designation?", "a": "Small miniature bearings print the bore as the final digit, so 628 is a 8 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "Which fits should I use for 628?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 24 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 628?", "a": "Catalogue mass is 18 g for 628; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 628 have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "628-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "628-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628-2RZ is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "628-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W628-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×24×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.47/1.12 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "628", "628" ], "locale_variants": {} }, { "sku": "628-2RS", "brand": "SKF", "manufacturer_designation": "628-2RS1", "series": "62800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 24, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.9, "static_load_kN": 1.66, "fatigue_load_limit_kN": 0.071, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 17, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 62800-series, the final digit is the bore in millimetres: 628 fits a 8 mm shaft (direct-number miniature spelling). The envelope is 8×24×8 mm (0.315×0.945×0.315 in) with a 8.0 mm radial section height, C 3.9 kN, C0 1.66 kN and Pu 0.071 kN. SKF catalogues the sealed execution as 628-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 19000 r/min, catalogue mass 17 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "hand-held power tools", "domestic appliances", "instrument and encoder drives", "model-making and hobby mechanics" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Catalogue ratings for 628-2RS (C 3.9 kN, C0 1.66 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Do not preload 628-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Contact seals make 628-2RS slower than the open 628 (limiting 19000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 628-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 628-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 628-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "A replacement 628 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 628-2RS?", "a": "The SKF 628-2RS1 measures 8 mm bore × 24 mm OD × 8 mm width (0.315 × 0.945 × 0.315 in), mass about 17 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How do I read the 628 designation?", "a": "Small miniature bearings print the bore as the final digit, so 628 is a 8 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "How heavy is 628-2RS?", "a": "Catalogue mass is 17 g for 628-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 628-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 628-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "628", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "628-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628-2RZ is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "628-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W628-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×24×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.47/1.12 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "628-2RS", "628-2RS1" ], "locale_variants": {} }, { "sku": "628-RSR", "brand": "SKF", "manufacturer_designation": "628-2RZ", "series": "62800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 24, "B_mm": 8, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.9, "static_load_kN": 1.66, "fatigue_load_limit_kN": 0.071, "reference_speed_rpm": 63000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 17, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 62800-series, the final digit is the bore in millimetres: 628 fits a 8 mm shaft (direct-number miniature spelling). The envelope is 8×24×8 mm (0.315×0.945×0.315 in) with a 8.0 mm radial section height, C 3.9 kN, C0 1.66 kN and Pu 0.071 kN. SKF lists this as 628-2RZ with a low-friction non-contact seal (2RSL/2RZ spelling): it runs near open-bearing speed with less drag than a contact seal but is not liquid-tight. Limiting speed 32000 r/min, catalogue mass 17 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "fractional-horsepower motors", "small fans and blowers", "hand-held power tools", "domestic appliances" ], "failure_modes": [ "fine dust or moisture passing the low-friction non-contact lip in dirty or wet duty", "grease loss past the low-drag seal when no regreasing schedule is kept", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 628-RSR home through the outer ring or balls brinells the raceways.", "Catalogue ratings for 628-RSR (C 3.9 kN, C0 1.66 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "The low-friction seal on 628-RSR saves drag versus a contact lip but is not liquid-tight; wet or chemically aggressive positions need the 2RS version.", "Do not pry the caps off 628-RSR to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "At 8 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 628-RSR (C 3.9 kN, C0 1.66 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "A replacement 628 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 628-RSR?", "a": "The SKF 628-2RZ measures 8 mm bore × 24 mm OD × 8 mm width (0.315 × 0.945 × 0.315 in), mass about 17 g. It has two low-friction non-contact rubber seals." }, { "q": "How do I read the 628 designation?", "a": "Small miniature bearings print the bore as the final digit, so 628 is a 8 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What load can 628-RSR take?", "a": "Catalogue values for 628-2RZ: dynamic C 3.9 kN, static C0 1.66 kN, fatigue limit Pu 0.071 kN. Use C in life calculation and C0 for static checks at 8 mm bore." }, { "q": "What is the speed rating of 628-RSR?", "a": "SKF lists a 63000 r/min thermal reference speed and a 32000 r/min mechanical limiting speed for 628-2RZ; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 628-RSR and a same-bore 62-series bearing?", "a": "Section height differs: 628-RSR has a 8 mm radial section and C 3.9 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "628", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "628-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "628-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W628-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×24×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.47/1.12 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "628-RSR", "628-2RZ" ], "locale_variants": {} }, { "sku": "628-ZZ", "brand": "SKF", "manufacturer_designation": "628-2Z", "series": "62800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 24, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.9, "static_load_kN": 1.66, "fatigue_load_limit_kN": 0.071, "reference_speed_rpm": 63000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 18, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 62800-series, the final digit is the bore in millimetres: 628 fits a 8 mm shaft (direct-number miniature spelling). The envelope is 8×24×8 mm (0.315×0.945×0.315 in) with a 8.0 mm radial section height, C 3.9 kN, C0 1.66 kN and Pu 0.071 kN. SKF spells the double shield 628-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 32000 r/min, catalogue mass 18 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "model-making and hobby mechanics", "small pumps", "office equipment", "fractional-horsepower motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 8 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Mount by heating the inner ring (max 120 °C) — driving 628-ZZ home through the outer ring or balls brinells the raceways.", "Shields on 628-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 628-2RS for washdown duty.", "Do not pry the caps off 628-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 628-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 628-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 628-ZZ?", "a": "The SKF 628-2Z measures 8 mm bore × 24 mm OD × 8 mm width (0.315 × 0.945 × 0.315 in), mass about 18 g. It has two non-contact sheet-metal shields." }, { "q": "How do I read the 628 designation?", "a": "Small miniature bearings print the bore as the final digit, so 628 is a 8 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "How long can a greased 628-ZZ be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 628-ZZ take?", "a": "Catalogue values for 628-2Z: dynamic C 3.9 kN, static C0 1.66 kN, fatigue limit Pu 0.071 kN. Use C in life calculation and C0 for static checks at 8 mm bore." }, { "q": "What is the speed rating of 628-ZZ?", "a": "SKF lists a 63000 r/min thermal reference speed and a 32000 r/min mechanical limiting speed for 628-2Z; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "628", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "628-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "628-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 8×24×8 mm envelope and equivalent catalogue ratings; 628-2RZ is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W628-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×24×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.47/1.12 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "628-ZZ", "628-2Z" ], "locale_variants": {} }, { "sku": "638-RSR", "brand": "SKF", "manufacturer_designation": "638-2RZ", "series": "63800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 28, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.33, "static_load_kN": 0.57, "fatigue_load_limit_kN": 0.024, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 30, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 63800-series, the final digit is the bore in millimetres: 638 fits a 8 mm shaft (direct-number miniature spelling). The envelope is 8×28×9 mm (0.315×1.102×0.354 in) with a 10.0 mm radial section height, C 1.33 kN, C0 0.57 kN and Pu 0.024 kN. SKF lists this as 638-2RZ with a low-friction non-contact seal (2RSL/2RZ spelling): it runs near open-bearing speed with less drag than a contact seal but is not liquid-tight. Limiting speed 30000 r/min, catalogue mass 30 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "small fans and blowers", "hand-held power tools", "domestic appliances", "instrument and encoder drives" ], "failure_modes": [ "fine dust or moisture passing the low-friction non-contact lip in dirty or wet duty", "grease loss past the low-drag seal when no regreasing schedule is kept", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 28 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 638-RSR.", "Catalogue ratings for 638-RSR (C 1.33 kN, C0 0.57 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "The low-friction seal on 638-RSR saves drag versus a contact lip but is not liquid-tight; wet or chemically aggressive positions need the 2RS version.", "Do not pry the caps off 638-RSR to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 638-RSR to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 638-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 638 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 638-RSR?", "a": "The SKF 638-2RZ measures 8 mm bore × 28 mm OD × 9 mm width (0.315 × 1.102 × 0.354 in), mass about 30 g. It has two low-friction non-contact rubber seals." }, { "q": "How do I read the 638 designation?", "a": "Small miniature bearings print the bore as the final digit, so 638 is a 8 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "How heavy is 638-RSR?", "a": "Catalogue mass is 30 g for 638-2RZ; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 638-RSR have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 638-RSR be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "638-RSR", "638-2RZ" ], "locale_variants": {} }, { "sku": "618-9", "brand": "SKF", "manufacturer_designation": "618/9", "series": "61800-series", "type": "deep_groove", "d_mm": 9, "D_mm": 17, "B_mm": 4, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.871, "static_load_kN": 0.34, "fatigue_load_limit_kN": 0.014, "reference_speed_rpm": 85000, "limiting_speed_rpm": 53000, "max_rpm": 53000, "weight_g": 3.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 61800-series, the bore is written directly after the slash as 9 mm (bores below 10 mm use the slash spelling). The envelope is 9×17×4 mm (0.354×0.669×0.157 in) with a 4.0 mm radial section height, C 0.871 kN, C0 0.34 kN and Pu 0.014 kN. The open 618/9 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 53000 r/min, catalogue mass 3.4 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 9 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Catalogue ratings for 618-9 (C 0.871 kN, C0 0.34 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Open 618-9 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-9; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 618-9 (C 0.871 kN, C0 0.34 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 618-9 home through the outer ring or balls brinells the raceways.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 618-9?", "a": "The SKF 618/9 measures 9 mm bore × 17 mm OD × 4 mm width (0.354 × 0.669 × 0.157 in), mass about 3.4 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/9?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/9 means 9 mm bore. The site slug 618-9 replaces the slash with a hyphen." }, { "q": "What internal clearance does 618-9 have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 618-9 be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 618-9 take?", "a": "Catalogue values for 618/9: dynamic C 0.871 kN, static C0 0.34 kN, fatigue limit Pu 0.014 kN. Use C in life calculation and C0 for static checks at 9 mm bore." } ], "cross_ref": [ { "equiv_sku": "W618-9", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×17×4 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.871/0.34 kN vs 0.761/0.335 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "618-9", "618/9" ], "locale_variants": {} }, { "sku": "628-9-2RS", "brand": "SKF", "manufacturer_designation": "628/9-2RS1", "series": "62800-series", "type": "deep_groove", "d_mm": 9, "D_mm": 17, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.43, "static_load_kN": 0.64, "fatigue_load_limit_kN": 0.027, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 4.3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 62800-series, the bore is written directly after the slash as 9 mm (bores below 10 mm use the slash spelling). The envelope is 9×17×5 mm (0.354×0.669×0.197 in) with a 4.0 mm radial section height, C 1.43 kN, C0 0.64 kN and Pu 0.027 kN. SKF catalogues the sealed execution as 628/9-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 24000 r/min, catalogue mass 4.3 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "fractional-horsepower motors", "small fans and blowers", "hand-held power tools", "domestic appliances" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 628/9-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Assign interference to the rotating ring: on a conventional shaft-mounted 9 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Contact seals make 628-9-2RS slower than the open 628/9 (limiting 24000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 628-9-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Deep-groove geometry tolerates only minutes of misalignment; if the 17 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 628-9-2RS.", "Do not preload 628-9-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "A replacement 628/9 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 628-9-2RS?", "a": "The SKF 628/9-2RS1 measures 9 mm bore × 17 mm OD × 5 mm width (0.354 × 0.669 × 0.197 in), mass about 4.3 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "Why is there a slash in the designation 628/9-2RS1?", "a": "The slash writes a bore that falls outside the two-digit code table: 628/9 means 9 mm bore. The site slug 628-9-2RS replaces the slash with a hyphen." }, { "q": "How long can a greased 628-9-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 628-9-2RS take?", "a": "Catalogue values for 628/9-2RS1: dynamic C 1.43 kN, static C0 0.64 kN, fatigue limit Pu 0.027 kN. Use C in life calculation and C0 for static checks at 9 mm bore." }, { "q": "What is the speed rating of 628-9-2RS?", "a": "SKF publishes only the 24000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." } ], "cross_ref": [ { "equiv_sku": "628-9-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×17×5 mm envelope and equivalent catalogue ratings; 628/9-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W628-9-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.43/0.64 kN vs 0.761/0.335 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W628-9-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.43/0.64 kN vs 0.761/0.335 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "628-9-2RS", "628/9-2RS1" ], "locale_variants": {} }, { "sku": "628-9-ZZ", "brand": "SKF", "manufacturer_designation": "628/9-2Z", "series": "62800-series", "type": "deep_groove", "d_mm": 9, "D_mm": 17, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.43, "static_load_kN": 0.64, "fatigue_load_limit_kN": 0.027, "reference_speed_rpm": 85000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 4.3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 62800-series, the bore is written directly after the slash as 9 mm (bores below 10 mm use the slash spelling). The envelope is 9×17×5 mm (0.354×0.669×0.197 in) with a 4.0 mm radial section height, C 1.43 kN, C0 0.64 kN and Pu 0.027 kN. SKF spells the double shield 628/9-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 43000 r/min, catalogue mass 4.3 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "domestic appliances", "instrument and encoder drives", "model-making and hobby mechanics", "small pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Catalogue ratings for 628-9-ZZ (C 1.43 kN, C0 0.64 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Clearance suffixes follow the seal code in the designation stack (e.g. 628/9-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Shields on 628-9-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 628/9-2RS for washdown duty.", "Do not pry the caps off 628-9-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Assign interference to the rotating ring: on a conventional shaft-mounted 9 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Deep-groove geometry tolerates only minutes of misalignment; if the 17 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 628-9-ZZ.", "Where two 628/9 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 628/9 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 628-9-ZZ?", "a": "The SKF 628/9-2Z measures 9 mm bore × 17 mm OD × 5 mm width (0.354 × 0.669 × 0.197 in), mass about 4.3 g. It has two non-contact sheet-metal shields." }, { "q": "Why is there a slash in the designation 628/9-2Z?", "a": "The slash writes a bore that falls outside the two-digit code table: 628/9 means 9 mm bore. The site slug 628-9-ZZ replaces the slash with a hyphen." }, { "q": "What is the difference between 628-9-ZZ and a same-bore 62-series bearing?", "a": "Section height differs: 628-9-ZZ has a 4 mm radial section and C 1.43 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 628-9-ZZ?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 17 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 628-9-ZZ?", "a": "Catalogue mass is 4.3 g for 628/9-2Z; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "628-9-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 9×17×5 mm envelope and equivalent catalogue ratings; 628/9-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W628-9-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.43/0.64 kN vs 0.761/0.335 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W628-9-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.43/0.64 kN vs 0.761/0.335 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "628-9-ZZ", "628/9-2Z" ], "locale_variants": {} }, { "sku": "619-9-ZZ", "brand": "SKF", "manufacturer_designation": "619/9-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 9, "D_mm": 20, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.34, "static_load_kN": 0.98, "fatigue_load_limit_kN": 0.043, "reference_speed_rpm": 80000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 7.6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 61900-series, the bore is written directly after the slash as 9 mm (bores below 10 mm use the slash spelling). The envelope is 9×20×6 mm (0.354×0.787×0.236 in) with a 5.5 mm radial section height, C 2.34 kN, C0 0.98 kN and Pu 0.043 kN. SKF spells the double shield 619/9-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 40000 r/min, catalogue mass 7.6 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "slew and indexing drives", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "The fatigue load limit is 0.043 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Clearance suffixes follow the seal code in the designation stack (e.g. 619/9-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Shields on 619-9-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 619/9-2RS for washdown duty.", "Do not pry the caps off 619-9-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "At 9 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 619-9-ZZ (C 2.34 kN, C0 0.98 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "For positions that need relubrication, choose the open execution of 619/9 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Where two 619/9 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 619-9-ZZ?", "a": "The SKF 619/9-2Z measures 9 mm bore × 20 mm OD × 6 mm width (0.354 × 0.787 × 0.236 in), mass about 7.6 g. It has two non-contact sheet-metal shields." }, { "q": "Why is there a slash in the designation 619/9-2Z?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/9 means 9 mm bore. The site slug 619-9-ZZ replaces the slash with a hyphen." }, { "q": "What load can 619-9-ZZ take?", "a": "Catalogue values for 619/9-2Z: dynamic C 2.34 kN, static C0 0.98 kN, fatigue limit Pu 0.043 kN. Use C in life calculation and C0 for static checks at 9 mm bore." }, { "q": "What is the speed rating of 619-9-ZZ?", "a": "SKF lists a 80000 r/min thermal reference speed and a 40000 r/min mechanical limiting speed for 619/9-2Z; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 619-9-ZZ and a same-bore 62-series bearing?", "a": "Section height differs: 619-9-ZZ has a 5.5 mm radial section and C 2.34 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "619-9", "equiv_brand": "SKF", "level": "full", "note": "Same 9×20×6 mm envelope and equivalent catalogue ratings; 619/9 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W619-9-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×20×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.98 kN vs 1.95/0.93 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-9", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×20×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.98 kN vs 1.95/0.93 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "619-9-ZZ", "619/9-2Z" ], "locale_variants": {} }, { "sku": "619-9", "brand": "SKF", "manufacturer_designation": "619/9", "series": "61900-series", "type": "deep_groove", "d_mm": 9, "D_mm": 20, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.34, "static_load_kN": 0.98, "fatigue_load_limit_kN": 0.043, "reference_speed_rpm": 80000, "limiting_speed_rpm": 50000, "max_rpm": 50000, "weight_g": 7.6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the miniature 61900-series, the bore is written directly after the slash as 9 mm (bores below 10 mm use the slash spelling). The envelope is 9×20×6 mm (0.354×0.787×0.236 in) with a 5.5 mm radial section height, C 2.34 kN, C0 0.98 kN and Pu 0.043 kN. The open 619/9 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 50000 r/min, catalogue mass 7.6 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "industrial electric motors", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Fillet radii must clear the 619-9 chamfer so the 6 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The fatigue load limit is 0.043 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Open 619-9 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-9; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 0.043 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Fillet radii must clear the 619-9 chamfer so the 6 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 619-9?", "a": "The SKF 619/9 measures 9 mm bore × 20 mm OD × 6 mm width (0.354 × 0.787 × 0.236 in), mass about 7.6 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/9?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/9 means 9 mm bore. The site slug 619-9 replaces the slash with a hyphen." }, { "q": "How heavy is 619-9?", "a": "Catalogue mass is 7.6 g for 619/9; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 619-9 have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 619-9 be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "619-9-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×20×6 mm envelope and equivalent catalogue ratings; 619/9-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W619-9-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×20×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.98 kN vs 1.95/0.93 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-9", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×20×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.34/0.98 kN vs 1.95/0.93 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "619-9", "619/9" ], "locale_variants": {} }, { "sku": "609", "brand": "SKF", "manufacturer_designation": "609", "series": "6000-series", "type": "deep_groove", "d_mm": 9, "D_mm": 24, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.9, "static_load_kN": 1.66, "fatigue_load_limit_kN": 0.071, "reference_speed_rpm": 70000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 14, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 609 fits a 9 mm shaft (direct-number miniature spelling). The envelope is 9×24×7 mm (0.354×0.945×0.276 in) with a 7.5 mm radial section height, C 3.9 kN, C0 1.66 kN and Pu 0.071 kN. The open 609 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 43000 r/min, catalogue mass 14 g.", "applications": [ "domestic appliances", "instrument and encoder drives", "model-making and hobby mechanics", "small pumps" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 9 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "The fatigue load limit is 0.071 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Open 609 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 609; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 609 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 609-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 609?", "a": "The SKF 609 measures 9 mm bore × 24 mm OD × 7 mm width (0.354 × 0.945 × 0.276 in), mass about 14 g. It is open, with no shields or seals." }, { "q": "How do I read the 609 designation?", "a": "Small miniature bearings print the bore as the final digit, so 609 is a 9 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "Which fits should I use for 609?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 24 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 609?", "a": "Catalogue mass is 14 g for 609; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 609 have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "609-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "609-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "609-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W609-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W609-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W609", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "609", "609" ], "locale_variants": {} }, { "sku": "609-2RS", "brand": "SKF", "manufacturer_designation": "609-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 9, "D_mm": 24, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.9, "static_load_kN": 1.66, "fatigue_load_limit_kN": 0.071, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 15, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 609 fits a 9 mm shaft (direct-number miniature spelling). The envelope is 9×24×7 mm (0.354×0.945×0.276 in) with a 7.5 mm radial section height, C 3.9 kN, C0 1.66 kN and Pu 0.071 kN. SKF catalogues the sealed execution as 609-2RSH: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 19000 r/min, catalogue mass 15 g.", "applications": [ "office equipment", "fractional-horsepower motors", "small fans and blowers", "hand-held power tools" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "At 9 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 609-2RS (C 3.9 kN, C0 1.66 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Contact seals make 609-2RS slower than the open 609 (limiting 19000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 609-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Fillet radii must clear the 609-2RS chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Assign interference to the rotating ring: on a conventional shaft-mounted 9 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 609 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 609-2RS?", "a": "The SKF 609-2RSH measures 9 mm bore × 24 mm OD × 7 mm width (0.354 × 0.945 × 0.276 in), mass about 15 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How do I read the 609 designation?", "a": "Small miniature bearings print the bore as the final digit, so 609 is a 9 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "Which fits should I use for 609-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 24 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 609-2RS?", "a": "Catalogue mass is 15 g for 609-2RSH; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 609-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "609", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "609-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "609-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W609-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W609-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W609", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "609-2RS", "609-2RSH" ], "locale_variants": {} }, { "sku": "609-RSR", "brand": "SKF", "manufacturer_designation": "609-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 9, "D_mm": 24, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.9, "static_load_kN": 1.66, "fatigue_load_limit_kN": 0.071, "reference_speed_rpm": 70000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 14, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 609 fits a 9 mm shaft (direct-number miniature spelling). The envelope is 9×24×7 mm (0.354×0.945×0.276 in) with a 7.5 mm radial section height, C 3.9 kN, C0 1.66 kN and Pu 0.071 kN. SKF lists this as 609-2RSL with a low-friction non-contact seal (2RSL/2RZ spelling): it runs near open-bearing speed with less drag than a contact seal but is not liquid-tight. Limiting speed 34000 r/min, catalogue mass 14 g.", "applications": [ "small fans and blowers", "hand-held power tools", "domestic appliances", "instrument and encoder drives" ], "failure_modes": [ "fine dust or moisture passing the low-friction non-contact lip in dirty or wet duty", "grease loss past the low-drag seal when no regreasing schedule is kept", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Fillet radii must clear the 609-RSR chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Do not preload 609-RSR to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The low-friction seal on 609-RSR saves drag versus a contact lip but is not liquid-tight; wet or chemically aggressive positions need the 2RS version.", "Do not pry the caps off 609-RSR to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Clearance suffixes follow the seal code in the designation stack (e.g. 609-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "At 9 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Where two 609 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 609 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 609-RSR?", "a": "The SKF 609-2RSL measures 9 mm bore × 24 mm OD × 7 mm width (0.354 × 0.945 × 0.276 in), mass about 14 g. It has two low-friction non-contact rubber seals." }, { "q": "How do I read the 609 designation?", "a": "Small miniature bearings print the bore as the final digit, so 609 is a 9 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What load can 609-RSR take?", "a": "Catalogue values for 609-2RSL: dynamic C 3.9 kN, static C0 1.66 kN, fatigue limit Pu 0.071 kN. Use C in life calculation and C0 for static checks at 9 mm bore." }, { "q": "What is the speed rating of 609-RSR?", "a": "SKF lists a 70000 r/min thermal reference speed and a 34000 r/min mechanical limiting speed for 609-2RSL; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 609-RSR and a same-bore 62-series bearing?", "a": "Section height differs: 609-RSR has a 7.5 mm radial section and C 3.9 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "609", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "609-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "609-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W609-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W609-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W609", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "609-RSR", "609-2RSL" ], "locale_variants": {} }, { "sku": "609-ZZ", "brand": "SKF", "manufacturer_designation": "609-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 9, "D_mm": 24, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.9, "static_load_kN": 1.66, "fatigue_load_limit_kN": 0.071, "reference_speed_rpm": 70000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 15, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the final digit is the bore in millimetres: 609 fits a 9 mm shaft (direct-number miniature spelling). The envelope is 9×24×7 mm (0.354×0.945×0.276 in) with a 7.5 mm radial section height, C 3.9 kN, C0 1.66 kN and Pu 0.071 kN. SKF spells the double shield 609-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 34000 r/min, catalogue mass 15 g.", "applications": [ "small pumps", "office equipment", "fractional-horsepower motors", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Do not preload 609-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "At 9 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Shields on 609-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 609-2RS for washdown duty.", "Do not pry the caps off 609-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Catalogue ratings for 609-ZZ (C 3.9 kN, C0 1.66 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 609-ZZ home through the outer ring or balls brinells the raceways.", "A replacement 609 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 609-ZZ?", "a": "The SKF 609-2Z measures 9 mm bore × 24 mm OD × 7 mm width (0.354 × 0.945 × 0.276 in), mass about 15 g. It has two non-contact sheet-metal shields." }, { "q": "How do I read the 609 designation?", "a": "Small miniature bearings print the bore as the final digit, so 609 is a 9 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "Which fits should I use for 609-ZZ?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 24 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 609-ZZ?", "a": "Catalogue mass is 15 g for 609-2Z; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 609-ZZ have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "609", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "609-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "609-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; 609-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W609-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W609-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W609", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.9/1.66 kN vs 2.03/0.815 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "609-ZZ", "609-2Z" ], "locale_variants": {} }, { "sku": "629", "brand": "SKF", "manufacturer_designation": "629", "series": "6200-series", "type": "deep_groove", "d_mm": 9, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 60000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 20, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the final digit is the bore in millimetres: 629 fits a 9 mm shaft (direct-number miniature spelling). The envelope is 9×26×8 mm (0.354×1.024×0.315 in) with a 8.5 mm radial section height, C 4.75 kN, C0 1.96 kN and Pu 0.083 kN. The open 629 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 38000 r/min, catalogue mass 20 g.", "applications": [ "model-making and hobby mechanics", "small pumps", "office equipment", "fractional-horsepower motors" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "The fatigue load limit is 0.083 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Assign interference to the rotating ring: on a conventional shaft-mounted 9 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Open 629 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 629; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 9 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Deep-groove geometry tolerates only minutes of misalignment; if the 26 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 629.", "Where two 629 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 629?", "a": "The SKF 629 measures 9 mm bore × 26 mm OD × 8 mm width (0.354 × 1.024 × 0.315 in), mass about 20 g. It is open, with no shields or seals." }, { "q": "How do I read the 629 designation?", "a": "Small miniature bearings print the bore as the final digit, so 629 is a 9 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What is the speed rating of 629?", "a": "SKF lists a 60000 r/min thermal reference speed and a 38000 r/min mechanical limiting speed for 629; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 629 and a same-bore 62-series bearing?", "a": "Section height differs: 629 has a 8.5 mm radial section and C 4.75 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 629?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 26 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "629-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "629-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "629-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W629-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (4.75/1.96 kN vs 3.97/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W629-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (4.75/1.96 kN vs 3.97/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "629", "629" ], "locale_variants": {} }, { "sku": "629-2RS", "brand": "SKF", "manufacturer_designation": "629-2RSH", "series": "6200-series", "type": "deep_groove", "d_mm": 9, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 20, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the final digit is the bore in millimetres: 629 fits a 9 mm shaft (direct-number miniature spelling). The envelope is 9×26×8 mm (0.354×1.024×0.315 in) with a 8.5 mm radial section height, C 4.75 kN, C0 1.96 kN and Pu 0.083 kN. SKF catalogues the sealed execution as 629-2RSH: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 19000 r/min, catalogue mass 20 g.", "applications": [ "model-making and hobby mechanics", "small pumps", "office equipment", "fractional-horsepower motors" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Fillet radii must clear the 629-2RS chamfer so the 8 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "At 9 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Contact seals make 629-2RS slower than the open 629 (limiting 19000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 629-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Clearance suffixes follow the seal code in the designation stack (e.g. 629-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "At 9 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Where two 629 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 629 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 629-2RS?", "a": "The SKF 629-2RSH measures 9 mm bore × 26 mm OD × 8 mm width (0.354 × 1.024 × 0.315 in), mass about 20 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How do I read the 629 designation?", "a": "Small miniature bearings print the bore as the final digit, so 629 is a 9 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "What is the speed rating of 629-2RS?", "a": "SKF publishes only the 19000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 629-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 629-2RS has a 8.5 mm radial section and C 4.75 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 629-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 26 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "629", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "629-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "629-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W629-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (4.75/1.96 kN vs 3.97/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W629-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (4.75/1.96 kN vs 3.97/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "629-2RS", "629-2RSH" ], "locale_variants": {} }, { "sku": "629-RSR", "brand": "SKF", "manufacturer_designation": "629-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 9, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 20, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the final digit is the bore in millimetres: 629 fits a 9 mm shaft (direct-number miniature spelling). The envelope is 9×26×8 mm (0.354×1.024×0.315 in) with a 8.5 mm radial section height, C 4.75 kN, C0 1.96 kN and Pu 0.083 kN. SKF lists this as 629-2RSL with a low-friction non-contact seal (2RSL/2RZ spelling): it runs near open-bearing speed with less drag than a contact seal but is not liquid-tight. Limiting speed 30000 r/min, catalogue mass 20 g.", "applications": [ "office equipment", "fractional-horsepower motors", "small fans and blowers", "hand-held power tools" ], "failure_modes": [ "fine dust or moisture passing the low-friction non-contact lip in dirty or wet duty", "grease loss past the low-drag seal when no regreasing schedule is kept", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 629-RSR home through the outer ring or balls brinells the raceways.", "Deep-groove geometry tolerates only minutes of misalignment; if the 26 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 629-RSR.", "The low-friction seal on 629-RSR saves drag versus a contact lip but is not liquid-tight; wet or chemically aggressive positions need the 2RS version.", "Do not pry the caps off 629-RSR to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Catalogue ratings for 629-RSR (C 4.75 kN, C0 1.96 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 629-RSR home through the outer ring or balls brinells the raceways.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 629-RSR?", "a": "The SKF 629-2RSL measures 9 mm bore × 26 mm OD × 8 mm width (0.354 × 1.024 × 0.315 in), mass about 20 g. It has two low-friction non-contact rubber seals." }, { "q": "How do I read the 629 designation?", "a": "Small miniature bearings print the bore as the final digit, so 629 is a 9 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "How long can a greased 629-RSR be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 629-RSR take?", "a": "Catalogue values for 629-2RSL: dynamic C 4.75 kN, static C0 1.96 kN, fatigue limit Pu 0.083 kN. Use C in life calculation and C0 for static checks at 9 mm bore." }, { "q": "What is the speed rating of 629-RSR?", "a": "SKF lists a 60000 r/min thermal reference speed and a 30000 r/min mechanical limiting speed for 629-2RSL; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "629", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "629-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "629-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W629-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (4.75/1.96 kN vs 3.97/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W629-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (4.75/1.96 kN vs 3.97/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "629-RSR", "629-2RSL" ], "locale_variants": {} }, { "sku": "629-ZZ", "brand": "SKF", "manufacturer_designation": "629-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 9, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 21, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the final digit is the bore in millimetres: 629 fits a 9 mm shaft (direct-number miniature spelling). The envelope is 9×26×8 mm (0.354×1.024×0.315 in) with a 8.5 mm radial section height, C 4.75 kN, C0 1.96 kN and Pu 0.083 kN. SKF spells the double shield 629-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 30000 r/min, catalogue mass 21 g.", "applications": [ "instrument and encoder drives", "model-making and hobby mechanics", "small pumps", "office equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 26 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 629-ZZ.", "Assign interference to the rotating ring: on a conventional shaft-mounted 9 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Shields on 629-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 629-2RS for washdown duty.", "Do not pry the caps off 629-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Clearance suffixes follow the seal code in the designation stack (e.g. 629-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "At 9 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 629 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 629-ZZ?", "a": "The SKF 629-2Z measures 9 mm bore × 26 mm OD × 8 mm width (0.354 × 1.024 × 0.315 in), mass about 21 g. It has two non-contact sheet-metal shields." }, { "q": "How do I read the 629 designation?", "a": "Small miniature bearings print the bore as the final digit, so 629 is a 9 mm bearing; the series digits in front give the section (OD/width family)." }, { "q": "How heavy is 629-ZZ?", "a": "Catalogue mass is 21 g for 629-2Z; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 629-ZZ have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 629-ZZ be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "629", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "629-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "629-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; 629-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W629-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (4.75/1.96 kN vs 3.97/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W629-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (4.75/1.96 kN vs 3.97/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "629-ZZ", "629-2Z" ], "locale_variants": {} }, { "sku": "63000-2RS", "brand": "SKF", "manufacturer_designation": "63000-2RS1", "series": "63000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 12, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 25, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 63000-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 00 follows the 10/12/15/17 mm exception table, so 63000 fits a 10 mm shaft. The envelope is 10×26×12 mm (0.394×1.024×0.472 in) with a 8.0 mm radial section height, C 4.62 kN, C0 1.96 kN and Pu 0.083 kN. SKF catalogues the sealed execution as 63000-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 19000 r/min, catalogue mass 25 g.", "applications": [ "textile machines", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 26 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 63000-2RS.", "Mount by heating the inner ring (max 120 °C) — driving 63000-2RS home through the outer ring or balls brinells the raceways.", "Contact seals make 63000-2RS slower than the open 63000 (limiting 19000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 63000-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 63000-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 63000-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 63000 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 63000-2RS?", "a": "The SKF 63000-2RS1 measures 10 mm bore × 26 mm OD × 12 mm width (0.394 × 1.024 × 0.472 in), mass about 25 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 63000 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 63000 fits a 10 mm shaft. Code × 5 starts at code 04." }, { "q": "How heavy is 63000-2RS?", "a": "Catalogue mass is 25 g for 63000-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 63000-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 63000-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63000-2RS", "63000-2RS1" ], "locale_variants": {} }, { "sku": "16100-ZZ", "brand": "SKF", "manufacturer_designation": "16100-2Z", "series": "16100-series", "type": "deep_groove", "d_mm": 10, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.07, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 26, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 16100-series is SKF's extra-narrow large-OD deep-groove section; bore code 00 follows the 10/12/15/17 mm exception table, so 16100 fits a 10 mm shaft. The envelope is 10×28×8 mm (0.394×1.102×0.315 in) with a 9.0 mm radial section height, C 5.07 kN, C0 2.36 kN and Pu 0.1 kN. SKF spells the double shield 16100-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 30000 r/min, catalogue mass 26 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "slew and indexing drives", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "At 10 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 16100-ZZ (C 5.07 kN, C0 2.36 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Shields on 16100-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 16100-2RS for washdown duty.", "Do not pry the caps off 16100-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Catalogue ratings for 16100-ZZ (C 5.07 kN, C0 2.36 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 16100-ZZ home through the outer ring or balls brinells the raceways.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 16100 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 16100-ZZ?", "a": "The SKF 16100-2Z measures 10 mm bore × 28 mm OD × 8 mm width (0.394 × 1.102 × 0.315 in), mass about 26 g. It has two non-contact sheet-metal shields." }, { "q": "How does the bore code in 16100 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 16100 fits a 10 mm shaft. Code × 5 starts at code 04." }, { "q": "Which fits should I use for 16100-ZZ?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 28 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 16100-ZZ?", "a": "Catalogue mass is 26 g for 16100-2Z; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 16100-ZZ have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "16100", "equiv_brand": "SKF", "level": "full", "note": "Same 10×28×8 mm envelope and equivalent catalogue ratings; 16100 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "16100-ZZ", "16100-2Z" ], "locale_variants": {} }, { "sku": "16100", "brand": "SKF", "manufacturer_designation": "16100", "series": "16100-series", "type": "deep_groove", "d_mm": 10, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.07, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 24, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 16100-series is SKF's extra-narrow large-OD deep-groove section; bore code 00 follows the 10/12/15/17 mm exception table, so 16100 fits a 10 mm shaft. The envelope is 10×28×8 mm (0.394×1.102×0.315 in) with a 9.0 mm radial section height, C 5.07 kN, C0 2.36 kN and Pu 0.1 kN. The open 16100 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 38000 r/min, catalogue mass 24 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Do not preload 16100 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Do not preload 16100 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Open 16100 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 16100; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 0.1 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Fillet radii must clear the 16100 chamfer so the 8 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 16100?", "a": "The SKF 16100 measures 10 mm bore × 28 mm OD × 8 mm width (0.394 × 1.102 × 0.315 in), mass about 24 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 16100 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 16100 fits a 10 mm shaft. Code × 5 starts at code 04." }, { "q": "What is the difference between 16100 and a same-bore 62-series bearing?", "a": "Section height differs: 16100 has a 9 mm radial section and C 5.07 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 16100?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 28 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 16100?", "a": "Catalogue mass is 24 g for 16100; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "16100-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×28×8 mm envelope and equivalent catalogue ratings; 16100-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "16100", "16100" ], "locale_variants": {} }, { "sku": "62200-2RS", "brand": "SKF", "manufacturer_designation": "62200-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 14, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.07, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 40, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 00 follows the 10/12/15/17 mm exception table, so 62200 fits a 10 mm shaft. The envelope is 10×30×14 mm (0.394×1.181×0.551 in) with a 10.0 mm radial section height, C 5.07 kN, C0 2.36 kN and Pu 0.1 kN. SKF catalogues the sealed execution as 62200-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 17000 r/min, catalogue mass 40 g.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyor drives" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "The fatigue load limit is 0.1 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The fatigue load limit is 0.1 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Contact seals make 62200-2RS slower than the open 62200 (limiting 17000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62200-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62200-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "At 10 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 62200 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 62200-2RS?", "a": "The SKF 62200-2RS1 measures 10 mm bore × 30 mm OD × 14 mm width (0.394 × 1.181 × 0.551 in), mass about 40 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62200 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 62200 fits a 10 mm shaft. Code × 5 starts at code 04." }, { "q": "How long can a greased 62200-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 62200-2RS take?", "a": "Catalogue values for 62200-2RS1: dynamic C 5.07 kN, static C0 2.36 kN, fatigue limit Pu 0.1 kN. Use C in life calculation and C0 for static checks at 10 mm bore." }, { "q": "What is the speed rating of 62200-2RS?", "a": "SKF publishes only the 17000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." } ], "cross_ref": [ { "equiv_sku": "4200-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×14 mm envelope as SKF 4200 ATN9, but catalogue C/C0 differ (5.07/2.36 kN vs 9.23/5.2 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62200-2RS", "62200-2RS1" ], "locale_variants": {} }, { "sku": "62300-2RS", "brand": "SKF", "manufacturer_designation": "62300-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 17, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.06, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 60, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 00 follows the 10/12/15/17 mm exception table, so 62300 fits a 10 mm shaft. The envelope is 10×35×17 mm (0.394×1.378×0.669 in) with a 12.5 mm radial section height, C 8.06 kN, C0 3.4 kN and Pu 0.143 kN. SKF catalogues the sealed execution as 62300-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 15000 r/min, catalogue mass 60 g.", "applications": [ "conveyor drives", "fans and blowers", "agricultural equipment", "garden machinery" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "The fatigue load limit is 0.143 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62300-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Contact seals make 62300-2RS slower than the open 62300 (limiting 15000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62300-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Assign interference to the rotating ring: on a conventional shaft-mounted 10 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Deep-groove geometry tolerates only minutes of misalignment; if the 35 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62300-2RS.", "Where two 62300 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 62300-2RS?", "a": "The SKF 62300-2RS1 measures 10 mm bore × 35 mm OD × 17 mm width (0.394 × 1.378 × 0.669 in), mass about 60 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62300 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 62300 fits a 10 mm shaft. Code × 5 starts at code 04." }, { "q": "What is the speed rating of 62300-2RS?", "a": "SKF publishes only the 15000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 62300-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62300-2RS has a 12.5 mm radial section and C 8.06 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 62300-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 35 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62300-2RS", "62300-2RS1" ], "locale_variants": {} }, { "sku": "63001-2RS", "brand": "SKF", "manufacturer_designation": "63001-2RS1", "series": "63000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 12, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.07, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 29, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 63000-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 01 follows the 10/12/15/17 mm exception table, so 63001 fits a 12 mm shaft. The envelope is 12×28×12 mm (0.472×1.102×0.472 in) with a 8.0 mm radial section height, C 5.07 kN, C0 2.36 kN and Pu 0.1 kN. SKF catalogues the sealed execution as 63001-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 17000 r/min, catalogue mass 29 g.", "applications": [ "fans and blowers", "agricultural equipment", "garden machinery", "textile machines" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 63001-2RS home through the outer ring or balls brinells the raceways.", "Deep-groove geometry tolerates only minutes of misalignment; if the 28 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 63001-2RS.", "Contact seals make 63001-2RS slower than the open 63001 (limiting 17000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 63001-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Deep-groove geometry tolerates only minutes of misalignment; if the 28 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 63001-2RS.", "Do not preload 63001-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "A replacement 63001 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 63001-2RS?", "a": "The SKF 63001-2RS1 measures 12 mm bore × 28 mm OD × 12 mm width (0.472 × 1.102 × 0.472 in), mass about 29 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 63001 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 63001 fits a 12 mm shaft. Code × 5 starts at code 04." }, { "q": "What is the speed rating of 63001-2RS?", "a": "SKF publishes only the 17000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 63001-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 63001-2RS has a 8 mm radial section and C 5.07 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 63001-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 28 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63001-2RS", "63001-2RS1" ], "locale_variants": {} }, { "sku": "16101-2RS", "brand": "SKF", "manufacturer_designation": "16101-2RS1", "series": "16100-series", "type": "deep_groove", "d_mm": 12, "D_mm": 30, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.07, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 28, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 16100-series is SKF's extra-narrow large-OD deep-groove section; bore code 01 follows the 10/12/15/17 mm exception table, so 16101 fits a 12 mm shaft. The envelope is 12×30×8 mm (0.472×1.181×0.315 in) with a 9.0 mm radial section height, C 5.07 kN, C0 2.36 kN and Pu 0.1 kN. SKF catalogues the sealed execution as 16101-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 17000 r/min, catalogue mass 28 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Fillet radii must clear the 16101-2RS chamfer so the 8 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The fatigue load limit is 0.1 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Contact seals make 16101-2RS slower than the open 16101 (limiting 17000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 16101-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "At 12 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 16101-2RS (C 5.07 kN, C0 2.36 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "For positions that need relubrication, choose the open execution of 16101 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 16101 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 16101-2RS?", "a": "The SKF 16101-2RS1 measures 12 mm bore × 30 mm OD × 8 mm width (0.472 × 1.181 × 0.315 in), mass about 28 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 16101 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 16101 fits a 12 mm shaft. Code × 5 starts at code 04." }, { "q": "How long can a greased 16101-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 16101-2RS take?", "a": "Catalogue values for 16101-2RS1: dynamic C 5.07 kN, static C0 2.36 kN, fatigue limit Pu 0.1 kN. Use C in life calculation and C0 for static checks at 12 mm bore." }, { "q": "What is the speed rating of 16101-2RS?", "a": "SKF publishes only the 17000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." } ], "cross_ref": [ { "equiv_sku": "16101-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×30×8 mm envelope and equivalent catalogue ratings; 16101-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "16101", "equiv_brand": "SKF", "level": "full", "note": "Same 12×30×8 mm envelope and equivalent catalogue ratings; 16101 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "16101-2RS", "16101-2RS1" ], "locale_variants": {} }, { "sku": "16101-ZZ", "brand": "SKF", "manufacturer_designation": "16101-2Z", "series": "16100-series", "type": "deep_groove", "d_mm": 12, "D_mm": 30, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.07, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 28, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 16100-series is SKF's extra-narrow large-OD deep-groove section; bore code 01 follows the 10/12/15/17 mm exception table, so 16101 fits a 12 mm shaft. The envelope is 12×30×8 mm (0.472×1.181×0.315 in) with a 9.0 mm radial section height, C 5.07 kN, C0 2.36 kN and Pu 0.1 kN. SKF spells the double shield 16101-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 28000 r/min, catalogue mass 28 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "machine tool auxiliaries", "agricultural gearboxes", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Do not preload 16101-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Catalogue ratings for 16101-ZZ (C 5.07 kN, C0 2.36 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Shields on 16101-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 16101-2RS for washdown duty.", "Do not pry the caps off 16101-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "At 12 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 16101-ZZ (C 5.07 kN, C0 2.36 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 16101-ZZ?", "a": "The SKF 16101-2Z measures 12 mm bore × 30 mm OD × 8 mm width (0.472 × 1.181 × 0.315 in), mass about 28 g. It has two non-contact sheet-metal shields." }, { "q": "How does the bore code in 16101 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 16101 fits a 12 mm shaft. Code × 5 starts at code 04." }, { "q": "How long can a greased 16101-ZZ be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 16101-ZZ take?", "a": "Catalogue values for 16101-2Z: dynamic C 5.07 kN, static C0 2.36 kN, fatigue limit Pu 0.1 kN. Use C in life calculation and C0 for static checks at 12 mm bore." }, { "q": "What is the speed rating of 16101-ZZ?", "a": "SKF lists a 56000 r/min thermal reference speed and a 28000 r/min mechanical limiting speed for 16101-2Z; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "16101-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×30×8 mm envelope and equivalent catalogue ratings; 16101-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "16101", "equiv_brand": "SKF", "level": "full", "note": "Same 12×30×8 mm envelope and equivalent catalogue ratings; 16101 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "16101-ZZ", "16101-2Z" ], "locale_variants": {} }, { "sku": "16101", "brand": "SKF", "manufacturer_designation": "16101", "series": "16100-series", "type": "deep_groove", "d_mm": 12, "D_mm": 30, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.07, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 26, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 16100-series is SKF's extra-narrow large-OD deep-groove section; bore code 01 follows the 10/12/15/17 mm exception table, so 16101 fits a 12 mm shaft. The envelope is 12×30×8 mm (0.472×1.181×0.315 in) with a 9.0 mm radial section height, C 5.07 kN, C0 2.36 kN and Pu 0.1 kN. The open 16101 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 38000 r/min, catalogue mass 26 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "slew and indexing drives", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 16101-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Deep-groove geometry tolerates only minutes of misalignment; if the 30 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 16101.", "Open 16101 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 16101; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 16101 home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.1 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 16101 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 16101?", "a": "The SKF 16101 measures 12 mm bore × 30 mm OD × 8 mm width (0.472 × 1.181 × 0.315 in), mass about 26 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 16101 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 16101 fits a 12 mm shaft. Code × 5 starts at code 04." }, { "q": "What load can 16101 take?", "a": "Catalogue values for 16101: dynamic C 5.07 kN, static C0 2.36 kN, fatigue limit Pu 0.1 kN. Use C in life calculation and C0 for static checks at 12 mm bore." }, { "q": "What is the speed rating of 16101?", "a": "SKF lists a 60000 r/min thermal reference speed and a 38000 r/min mechanical limiting speed for 16101; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 16101 and a same-bore 62-series bearing?", "a": "Section height differs: 16101 has a 9 mm radial section and C 5.07 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "16101-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×30×8 mm envelope and equivalent catalogue ratings; 16101-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "16101-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×30×8 mm envelope and equivalent catalogue ratings; 16101-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "16101", "16101" ], "locale_variants": {} }, { "sku": "62201-2RS", "brand": "SKF", "manufacturer_designation": "62201-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 14, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.89, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 45, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 01 follows the 10/12/15/17 mm exception table, so 62201 fits a 12 mm shaft. The envelope is 12×32×14 mm (0.472×1.26×0.551 in) with a 10.0 mm radial section height, C 6.89 kN, C0 3.1 kN and Pu 0.132 kN. SKF catalogues the sealed execution as 62201-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 15000 r/min, catalogue mass 45 g.", "applications": [ "conveyor drives", "fans and blowers", "agricultural equipment", "garden machinery" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Catalogue ratings for 62201-2RS (C 6.89 kN, C0 3.1 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "At 12 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Contact seals make 62201-2RS slower than the open 62201 (limiting 15000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62201-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Mount by heating the inner ring (max 120 °C) — driving 62201-2RS home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.132 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 62201 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 62201 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 62201-2RS?", "a": "The SKF 62201-2RS1 measures 12 mm bore × 32 mm OD × 14 mm width (0.472 × 1.26 × 0.551 in), mass about 45 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62201 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 62201 fits a 12 mm shaft. Code × 5 starts at code 04." }, { "q": "What is the speed rating of 62201-2RS?", "a": "SKF publishes only the 15000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 62201-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62201-2RS has a 10 mm radial section and C 6.89 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 62201-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 32 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "4201-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×14 mm envelope as SKF 4201 ATN9, but catalogue C/C0 differ (6.89/3.1 kN vs 10.6/6.2 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62201-2RS", "62201-2RS1" ], "locale_variants": {} }, { "sku": "62301-2RS", "brand": "SKF", "manufacturer_designation": "62301-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 17, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.75, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 70, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 01 follows the 10/12/15/17 mm exception table, so 62301 fits a 12 mm shaft. The envelope is 12×37×17 mm (0.472×1.457×0.669 in) with a 12.5 mm radial section height, C 9.75 kN, C0 4.15 kN and Pu 0.176 kN. SKF catalogues the sealed execution as 62301-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 14000 r/min, catalogue mass 70 g.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyor drives" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 62301-2RS home through the outer ring or balls brinells the raceways.", "Assign interference to the rotating ring: on a conventional shaft-mounted 12 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Contact seals make 62301-2RS slower than the open 62301 (limiting 14000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62301-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Fillet radii must clear the 62301-2RS chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Assign interference to the rotating ring: on a conventional shaft-mounted 12 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "A replacement 62301 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 62301 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 62301-2RS?", "a": "The SKF 62301-2RS1 measures 12 mm bore × 37 mm OD × 17 mm width (0.472 × 1.457 × 0.669 in), mass about 70 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62301 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 62301 fits a 12 mm shaft. Code × 5 starts at code 04." }, { "q": "What internal clearance does 62301-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 62301-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 62301-2RS take?", "a": "Catalogue values for 62301-2RS1: dynamic C 9.75 kN, static C0 4.15 kN, fatigue limit Pu 0.176 kN. Use C in life calculation and C0 for static checks at 12 mm bore." } ], "cross_ref": [ { "equiv_sku": "4301-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×17 mm envelope as SKF 4301 ATN9, but catalogue C/C0 differ (9.75/4.15 kN vs 13/7.8 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62301-2RS", "62301-2RS1" ], "locale_variants": {} }, { "sku": "16002-ZZ", "brand": "SKF", "manufacturer_designation": "16002-2Z", "series": "16000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 25, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series, bore code 02 follows the 10/12/15/17 mm exception table, so 16002 fits a 15 mm shaft. The envelope is 15×32×8 mm (0.591×1.26×0.315 in) with a 8.5 mm radial section height, C 5.85 kN, C0 2.85 kN and Pu 0.12 kN. SKF spells the double shield 16002-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 26000 r/min, catalogue mass 25 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "industrial electric motors", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 32 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 16002-ZZ.", "Deep-groove geometry tolerates only minutes of misalignment; if the 32 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 16002-ZZ.", "Shields on 16002-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 16002-2RS for washdown duty.", "Do not pry the caps off 16002-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Mount by heating the inner ring (max 120 °C) — driving 16002-ZZ home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.12 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 16002 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 16002-ZZ?", "a": "The SKF 16002-2Z measures 15 mm bore × 32 mm OD × 8 mm width (0.591 × 1.26 × 0.315 in), mass about 25 g. It has two non-contact sheet-metal shields." }, { "q": "How does the bore code in 16002 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 16002 fits a 15 mm shaft. Code × 5 starts at code 04." }, { "q": "How long can a greased 16002-ZZ be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 16002-ZZ take?", "a": "Catalogue values for 16002-2Z: dynamic C 5.85 kN, static C0 2.85 kN, fatigue limit Pu 0.12 kN. Use C in life calculation and C0 for static checks at 15 mm bore." }, { "q": "What is the speed rating of 16002-ZZ?", "a": "SKF lists a 50000 r/min thermal reference speed and a 26000 r/min mechanical limiting speed for 16002-2Z; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "16002", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 16002 on the same 15×32×8 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "16002-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 16002 on the same 15×32×8 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "16002-ZZ", "16002-2Z" ], "locale_variants": {} }, { "sku": "63002-2RS", "brand": "SKF", "manufacturer_designation": "63002-2RS1", "series": "63000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.59, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 39, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 63000-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 02 follows the 10/12/15/17 mm exception table, so 63002 fits a 15 mm shaft. The envelope is 15×32×13 mm (0.591×1.26×0.512 in) with a 8.5 mm radial section height, C 5.59 kN, C0 2.85 kN and Pu 0.12 kN. SKF catalogues the sealed execution as 63002-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 14000 r/min, catalogue mass 39 g.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyor drives", "fans and blowers" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "At 15 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 63002-2RS (C 5.59 kN, C0 2.85 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Contact seals make 63002-2RS slower than the open 63002 (limiting 14000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 63002-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Deep-groove geometry tolerates only minutes of misalignment; if the 32 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 63002-2RS.", "Do not preload 63002-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 63002 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Where two 63002 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 63002-2RS?", "a": "The SKF 63002-2RS1 measures 15 mm bore × 32 mm OD × 13 mm width (0.591 × 1.26 × 0.512 in), mass about 39 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 63002 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 63002 fits a 15 mm shaft. Code × 5 starts at code 04." }, { "q": "What is the difference between 63002-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 63002-2RS has a 8.5 mm radial section and C 5.59 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 63002-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 32 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 63002-2RS?", "a": "Catalogue mass is 39 g for 63002-2RS1; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63002-2RS", "63002-2RS1" ], "locale_variants": {} }, { "sku": "62202-2RS", "brand": "SKF", "manufacturer_designation": "62202-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 14, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.8, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 54, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 02 follows the 10/12/15/17 mm exception table, so 62202 fits a 15 mm shaft. The envelope is 15×35×14 mm (0.591×1.378×0.551 in) with a 10.0 mm radial section height, C 7.8 kN, C0 3.75 kN and Pu 0.16 kN. SKF catalogues the sealed execution as 62202-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 13000 r/min, catalogue mass 54 g.", "applications": [ "small gearboxes", "conveyor drives", "fans and blowers", "agricultural equipment" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Catalogue ratings for 62202-2RS (C 7.8 kN, C0 3.75 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Catalogue ratings for 62202-2RS (C 7.8 kN, C0 3.75 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Contact seals make 62202-2RS slower than the open 62202 (limiting 13000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62202-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62202-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "At 15 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 62202-2RS?", "a": "The SKF 62202-2RS1 measures 15 mm bore × 35 mm OD × 14 mm width (0.591 × 1.378 × 0.551 in), mass about 54 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62202 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 62202 fits a 15 mm shaft. Code × 5 starts at code 04." }, { "q": "Which fits should I use for 62202-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 35 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 62202-2RS?", "a": "Catalogue mass is 54 g for 62202-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 62202-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "4202-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×14 mm envelope as SKF 4202 ATN9, but catalogue C/C0 differ (7.8/3.75 kN vs 11.9/7.5 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62202-2RS", "62202-2RS1" ], "locale_variants": {} }, { "sku": "62302-2RS", "brand": "SKF", "manufacturer_designation": "62302-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 17, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.4, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 02 follows the 10/12/15/17 mm exception table, so 62302 fits a 15 mm shaft. The envelope is 15×42×17 mm (0.591×1.654×0.669 in) with a 13.5 mm radial section height, C 11.4 kN, C0 5.4 kN and Pu 0.228 kN. SKF catalogues the sealed execution as 62302-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 12000 r/min, catalogue mass 110 g.", "applications": [ "agricultural equipment", "garden machinery", "textile machines", "electric motors" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "At 15 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Fillet radii must clear the 62302-2RS chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Contact seals make 62302-2RS slower than the open 62302 (limiting 12000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62302-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 62302-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62302-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 62302 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 62302-2RS?", "a": "The SKF 62302-2RS1 measures 15 mm bore × 42 mm OD × 17 mm width (0.591 × 1.654 × 0.669 in), mass about 110 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62302 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 62302 fits a 15 mm shaft. Code × 5 starts at code 04." }, { "q": "What is the difference between 62302-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62302-2RS has a 13.5 mm radial section and C 11.4 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 62302-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 42 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 62302-2RS?", "a": "Catalogue mass is 110 g for 62302-2RS1; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "4302-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×17 mm envelope as SKF 4302 ATN9, but catalogue C/C0 differ (11.4/5.4 kN vs 14.8/9.5 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62302-2RS", "62302-2RS1" ], "locale_variants": {} }, { "sku": "16003-ZZ", "brand": "SKF", "manufacturer_designation": "16003-2Z", "series": "16000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 32, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series, bore code 03 follows the 10/12/15/17 mm exception table, so 16003 fits a 17 mm shaft. The envelope is 17×35×8 mm (0.669×1.378×0.315 in) with a 9.0 mm radial section height, C 6.37 kN, C0 3.25 kN and Pu 0.137 kN. SKF spells the double shield 16003-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 22000 r/min, catalogue mass 32 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "slew and indexing drives", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Catalogue ratings for 16003-ZZ (C 6.37 kN, C0 3.25 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Catalogue ratings for 16003-ZZ (C 6.37 kN, C0 3.25 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Shields on 16003-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 16003-2RS for washdown duty.", "Do not pry the caps off 16003-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Deep-groove geometry tolerates only minutes of misalignment; if the 35 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 16003-ZZ.", "Do not preload 16003-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 16003 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 16003 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 16003-ZZ?", "a": "The SKF 16003-2Z measures 17 mm bore × 35 mm OD × 8 mm width (0.669 × 1.378 × 0.315 in), mass about 32 g. It has two non-contact sheet-metal shields." }, { "q": "How does the bore code in 16003 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 16003 fits a 17 mm shaft. Code × 5 starts at code 04." }, { "q": "What is the speed rating of 16003-ZZ?", "a": "SKF lists a 45000 r/min thermal reference speed and a 22000 r/min mechanical limiting speed for 16003-2Z; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 16003-ZZ and a same-bore 62-series bearing?", "a": "Section height differs: 16003-ZZ has a 9 mm radial section and C 6.37 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 16003-ZZ?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 35 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "16003", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 16003 on the same 17×35×8 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "16003-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 16003 on the same 17×35×8 mm envelope, but catalogue C/C0 differ (6.37/3.25 kN vs 7.55/3.35 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "16003-ZZ", "16003-2Z" ], "locale_variants": {} }, { "sku": "63003-2RS", "brand": "SKF", "manufacturer_designation": "63003-2RS1", "series": "63000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 14, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.05, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 52, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 63000-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 03 follows the 10/12/15/17 mm exception table, so 63003 fits a 17 mm shaft. The envelope is 17×35×14 mm (0.669×1.378×0.551 in) with a 9.0 mm radial section height, C 6.05 kN, C0 3.25 kN and Pu 0.137 kN. SKF catalogues the sealed execution as 63003-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 13000 r/min, catalogue mass 52 g.", "applications": [ "garden machinery", "textile machines", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Fillet radii must clear the 63003-2RS chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "At 17 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Contact seals make 63003-2RS slower than the open 63003 (limiting 13000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 63003-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Mount by heating the inner ring (max 120 °C) — driving 63003-2RS home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.137 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 63003-2RS?", "a": "The SKF 63003-2RS1 measures 17 mm bore × 35 mm OD × 14 mm width (0.669 × 1.378 × 0.551 in), mass about 52 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 63003 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 63003 fits a 17 mm shaft. Code × 5 starts at code 04." }, { "q": "What internal clearance does 63003-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 63003-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 63003-2RS take?", "a": "Catalogue values for 63003-2RS1: dynamic C 6.05 kN, static C0 3.25 kN, fatigue limit Pu 0.137 kN. Use C in life calculation and C0 for static checks at 17 mm bore." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63003-2RS", "63003-2RS1" ], "locale_variants": {} }, { "sku": "62203-2RS", "brand": "SKF", "manufacturer_designation": "62203-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.56, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 89, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 03 follows the 10/12/15/17 mm exception table, so 62203 fits a 17 mm shaft. The envelope is 17×40×16 mm (0.669×1.575×0.63 in) with a 11.5 mm radial section height, C 9.56 kN, C0 4.75 kN and Pu 0.2 kN. SKF catalogues the sealed execution as 62203-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 12000 r/min, catalogue mass 89 g.", "applications": [ "agricultural equipment", "garden machinery", "textile machines", "electric motors" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 40 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62203-2RS.", "Catalogue ratings for 62203-2RS (C 9.56 kN, C0 4.75 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Contact seals make 62203-2RS slower than the open 62203 (limiting 12000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62203-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Fillet radii must clear the 62203-2RS chamfer so the 16 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Assign interference to the rotating ring: on a conventional shaft-mounted 17 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 62203 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 62203-2RS?", "a": "The SKF 62203-2RS1 measures 17 mm bore × 40 mm OD × 16 mm width (0.669 × 1.575 × 0.63 in), mass about 89 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62203 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 62203 fits a 17 mm shaft. Code × 5 starts at code 04." }, { "q": "What is the difference between 62203-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62203-2RS has a 11.5 mm radial section and C 9.56 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 62203-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 40 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 62203-2RS?", "a": "Catalogue mass is 89 g for 62203-2RS1; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "4203-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×16 mm envelope as SKF 4203 ATN9, but catalogue C/C0 differ (9.56/4.75 kN vs 14.8/9.5 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62203-2RS", "62203-2RS1" ], "locale_variants": {} }, { "sku": "62303-2RS", "brand": "SKF", "manufacturer_designation": "62303-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 19, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); bore code 03 follows the 10/12/15/17 mm exception table, so 62303 fits a 17 mm shaft. The envelope is 17×47×19 mm (0.669×1.85×0.748 in) with a 15.0 mm radial section height, C 13.5 kN, C0 6.55 kN and Pu 0.275 kN. SKF catalogues the sealed execution as 62303-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 11000 r/min, catalogue mass 160 g.", "applications": [ "small gearboxes", "conveyor drives", "fans and blowers", "agricultural equipment" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "The fatigue load limit is 0.275 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Mount by heating the inner ring (max 120 °C) — driving 62303-2RS home through the outer ring or balls brinells the raceways.", "Contact seals make 62303-2RS slower than the open 62303 (limiting 11000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62303-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "At 17 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 62303-2RS (C 13.5 kN, C0 6.55 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 62303-2RS?", "a": "The SKF 62303-2RS1 measures 17 mm bore × 47 mm OD × 19 mm width (0.669 × 1.85 × 0.748 in), mass about 160 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62303 work?", "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 62303 fits a 17 mm shaft. Code × 5 starts at code 04." }, { "q": "Which fits should I use for 62303-2RS?", "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 47 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 62303-2RS?", "a": "Catalogue mass is 160 g for 62303-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 62303-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "4303-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×19 mm envelope as SKF 4303 ATN9, but catalogue C/C0 differ (13.5/6.55 kN vs 19.5/13.2 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62303-2RS", "62303-2RS1" ], "locale_variants": {} }, { "sku": "63004-2RS", "brand": "SKF", "manufacturer_designation": "63004-2RS1", "series": "63000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.36, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 86, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 63000-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 63004 carries code 04 = 20 mm (code × 5). The envelope is 20×42×16 mm (0.787×1.654×0.63 in) with a 11.0 mm radial section height, C 9.36 kN, C0 5 kN and Pu 0.212 kN. SKF catalogues the sealed execution as 63004-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 11000 r/min, catalogue mass 86 g.", "applications": [ "conveyor drives", "fans and blowers", "agricultural equipment", "garden machinery" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 63004-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Deep-groove geometry tolerates only minutes of misalignment; if the 42 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 63004-2RS.", "Contact seals make 63004-2RS slower than the open 63004 (limiting 11000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 63004-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "At 20 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 63004-2RS (C 9.36 kN, C0 5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "For positions that need relubrication, choose the open execution of 63004 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 63004-2RS?", "a": "The SKF 63004-2RS1 measures 20 mm bore × 42 mm OD × 16 mm width (0.787 × 1.654 × 0.63 in), mass about 86 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 63004 work?", "a": "The final two digits of 63004 are bore code 04, multiplied by 5 to give 20 mm." }, { "q": "How long can a greased 63004-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 63004-2RS take?", "a": "Catalogue values for 63004-2RS1: dynamic C 9.36 kN, static C0 5 kN, fatigue limit Pu 0.212 kN. Use C in life calculation and C0 for static checks at 20 mm bore." }, { "q": "What is the speed rating of 63004-2RS?", "a": "SKF publishes only the 11000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63004-2RS", "63004-2RS1" ], "locale_variants": {} }, { "sku": "62204-2RS", "brand": "SKF", "manufacturer_designation": "62204-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62204 carries code 04 = 20 mm (code × 5). The envelope is 20×47×18 mm (0.787×1.85×0.709 in) with a 13.5 mm radial section height, C 12.7 kN, C0 6.55 kN and Pu 0.28 kN. SKF catalogues the sealed execution as 62204-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 10000 r/min, catalogue mass 130 g.", "applications": [ "fans and blowers", "agricultural equipment", "garden machinery", "textile machines" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 62204-2RS home through the outer ring or balls brinells the raceways.", "Catalogue ratings for 62204-2RS (C 12.7 kN, C0 6.55 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Contact seals make 62204-2RS slower than the open 62204 (limiting 10000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62204-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 62204-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62204-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "A replacement 62204 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 62204 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 62204-2RS?", "a": "The SKF 62204-2RS1 measures 20 mm bore × 47 mm OD × 18 mm width (0.787 × 1.85 × 0.709 in), mass about 130 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62204 work?", "a": "The final two digits of 62204 are bore code 04, multiplied by 5 to give 20 mm." }, { "q": "What is the speed rating of 62204-2RS?", "a": "SKF publishes only the 10000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 62204-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62204-2RS has a 13.5 mm radial section and C 12.7 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 62204-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 47 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "4204-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×47×18 mm envelope as SKF 4204 ATN9, but catalogue C/C0 differ (12.7/6.55 kN vs 17.8/12.5 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62204-2RS", "62204-2RS1" ], "locale_variants": {} }, { "sku": "62304-2RS", "brand": "SKF", "manufacturer_designation": "62304-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 21, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 15.9, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62304 carries code 04 = 20 mm (code × 5). The envelope is 20×52×21 mm (0.787×2.047×0.827 in) with a 16.0 mm radial section height, C 15.9 kN, C0 7.8 kN and Pu 0.335 kN. SKF catalogues the sealed execution as 62304-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 9500 r/min, catalogue mass 210 g.", "applications": [ "textile machines", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Catalogue ratings for 62304-2RS (C 15.9 kN, C0 7.8 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Assign interference to the rotating ring: on a conventional shaft-mounted 20 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Contact seals make 62304-2RS slower than the open 62304 (limiting 9500 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62304-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Deep-groove geometry tolerates only minutes of misalignment; if the 52 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62304-2RS.", "Do not preload 62304-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 62304 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 62304 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 62304-2RS?", "a": "The SKF 62304-2RS1 measures 20 mm bore × 52 mm OD × 21 mm width (0.787 × 2.047 × 0.827 in), mass about 210 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62304 work?", "a": "The final two digits of 62304 are bore code 04, multiplied by 5 to give 20 mm." }, { "q": "Which fits should I use for 62304-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 52 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 62304-2RS?", "a": "Catalogue mass is 210 g for 62304-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 62304-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "4304-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×52×21 mm envelope as SKF 4304 ATN9, but catalogue C/C0 differ (15.9/7.8 kN vs 23.4/16 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62304-2RS", "62304-2RS1" ], "locale_variants": {} }, { "sku": "62-22-2RS", "brand": "SKF", "manufacturer_designation": "62/22-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 22, "D_mm": 50, "B_mm": 14, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 7.65, "fatigue_load_limit_kN": 0.325, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6200-series, the bore is written directly after the slash as 22 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 22×50×14 mm (0.866×1.969×0.551 in) with a 14.0 mm radial section height, C 14 kN, C0 7.65 kN and Pu 0.325 kN. SKF catalogues the sealed execution as 62/22-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 9000 r/min, catalogue mass 120 g.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyor drives", "fans and blowers" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "The fatigue load limit is 0.325 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Deep-groove geometry tolerates only minutes of misalignment; if the 50 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62-22-2RS.", "Contact seals make 62-22-2RS slower than the open 62/22 (limiting 9000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62-22-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Mount by heating the inner ring (max 120 °C) — driving 62-22-2RS home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.325 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 62/22 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 62-22-2RS?", "a": "The SKF 62/22-2RS1 measures 22 mm bore × 50 mm OD × 14 mm width (0.866 × 1.969 × 0.551 in), mass about 120 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "Why is there a slash in the designation 62/22-2RS1?", "a": "The slash writes a bore that falls outside the two-digit code table: 62/22 means 22 mm bore. The site slug 62-22-2RS replaces the slash with a hyphen." }, { "q": "What internal clearance does 62-22-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 62-22-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 62-22-2RS take?", "a": "Catalogue values for 62/22-2RS1: dynamic C 14 kN, static C0 7.65 kN, fatigue limit Pu 0.325 kN. Use C in life calculation and C0 for static checks at 22 mm bore." } ], "cross_ref": [ { "equiv_sku": "62-22", "equiv_brand": "SKF", "level": "full", "note": "Same 22×50×14 mm envelope and equivalent catalogue ratings; 62/22 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62-22-2RS", "62/22-2RS1" ], "locale_variants": {} }, { "sku": "62-22", "brand": "SKF", "manufacturer_designation": "62/22", "series": "6200-series", "type": "deep_groove", "d_mm": 22, "D_mm": 50, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 7.65, "fatigue_load_limit_kN": 0.325, "reference_speed_rpm": 30000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6200-series, the bore is written directly after the slash as 22 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 22×50×14 mm (0.866×1.969×0.551 in) with a 14.0 mm radial section height, C 14 kN, C0 7.65 kN and Pu 0.325 kN. The open 62/22 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 19000 r/min, catalogue mass 120 g.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyor drives", "fans and blowers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 22 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Mount by heating the inner ring (max 120 °C) — driving 62-22 home through the outer ring or balls brinells the raceways.", "Open 62-22 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 62-22; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 0.325 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Fillet radii must clear the 62-22 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 62/22 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Where two 62/22 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 62-22?", "a": "The SKF 62/22 measures 22 mm bore × 50 mm OD × 14 mm width (0.866 × 1.969 × 0.551 in), mass about 120 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 62/22?", "a": "The slash writes a bore that falls outside the two-digit code table: 62/22 means 22 mm bore. The site slug 62-22 replaces the slash with a hyphen." }, { "q": "How long can a greased 62-22 be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 62-22 take?", "a": "Catalogue values for 62/22: dynamic C 14 kN, static C0 7.65 kN, fatigue limit Pu 0.325 kN. Use C in life calculation and C0 for static checks at 22 mm bore." }, { "q": "What is the speed rating of 62-22?", "a": "SKF lists a 30000 r/min thermal reference speed and a 19000 r/min mechanical limiting speed for 62/22; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "62-22-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 22×50×14 mm envelope and equivalent catalogue ratings; 62/22-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62-22", "62/22" ], "locale_variants": {} }, { "sku": "63-22", "brand": "SKF", "manufacturer_designation": "63/22", "series": "6300-series", "type": "deep_groove", "d_mm": 22, "D_mm": 56, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 18.6, "static_load_kN": 9.3, "fatigue_load_limit_kN": 0.39, "reference_speed_rpm": 28000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6300-series, the bore is written directly after the slash as 22 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 22×56×16 mm (0.866×2.205×0.63 in) with a 17.0 mm radial section height, C 18.6 kN, C0 9.3 kN and Pu 0.39 kN. The open 63/22 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 18000 r/min, catalogue mass 180 g.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Do not preload 63-22 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Assign interference to the rotating ring: on a conventional shaft-mounted 22 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Open 63-22 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 63-22; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 22 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 63-22 (C 18.6 kN, C0 9.3 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 63-22?", "a": "The SKF 63/22 measures 22 mm bore × 56 mm OD × 16 mm width (0.866 × 2.205 × 0.63 in), mass about 180 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 63/22?", "a": "The slash writes a bore that falls outside the two-digit code table: 63/22 means 22 mm bore. The site slug 63-22 replaces the slash with a hyphen." }, { "q": "How long can a greased 63-22 be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 63-22 take?", "a": "Catalogue values for 63/22: dynamic C 18.6 kN, static C0 9.3 kN, fatigue limit Pu 0.39 kN. Use C in life calculation and C0 for static checks at 22 mm bore." }, { "q": "What is the speed rating of 63-22?", "a": "SKF lists a 28000 r/min thermal reference speed and a 18000 r/min mechanical limiting speed for 63/22; real limits also depend on lubrication and fits." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63-22", "63/22" ], "locale_variants": {} }, { "sku": "63005-2RS", "brand": "SKF", "manufacturer_designation": "63005-2RS1", "series": "63000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.2, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 63000-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 63005 carries code 05 = 25 mm (code × 5). The envelope is 25×47×16 mm (0.984×1.85×0.63 in) with a 11.0 mm radial section height, C 11.2 kN, C0 6.55 kN and Pu 0.275 kN. SKF catalogues the sealed execution as 63005-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 9500 r/min, catalogue mass 110 g.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyor drives" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 25 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Clearance suffixes follow the seal code in the designation stack (e.g. 63005-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Contact seals make 63005-2RS slower than the open 63005 (limiting 9500 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 63005-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Mount by heating the inner ring (max 120 °C) — driving 63005-2RS home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.275 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "A replacement 63005 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 63005-2RS?", "a": "The SKF 63005-2RS1 measures 25 mm bore × 47 mm OD × 16 mm width (0.984 × 1.85 × 0.63 in), mass about 110 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 63005 work?", "a": "The final two digits of 63005 are bore code 05, multiplied by 5 to give 25 mm." }, { "q": "What internal clearance does 63005-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 63005-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 63005-2RS take?", "a": "Catalogue values for 63005-2RS1: dynamic C 11.2 kN, static C0 6.55 kN, fatigue limit Pu 0.275 kN. Use C in life calculation and C0 for static checks at 25 mm bore." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63005-2RS", "63005-2RS1" ], "locale_variants": {} }, { "sku": "62205-2RS", "brand": "SKF", "manufacturer_designation": "62205-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62205 carries code 05 = 25 mm (code × 5). The envelope is 25×52×18 mm (0.984×2.047×0.709 in) with a 13.5 mm radial section height, C 14 kN, C0 7.8 kN and Pu 0.335 kN. SKF catalogues the sealed execution as 62205-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 8500 r/min, catalogue mass 130 g.", "applications": [ "textile machines", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Fillet radii must clear the 62205-2RS chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Contact seals make 62205-2RS slower than the open 62205 (limiting 8500 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62205-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Mount by heating the inner ring (max 120 °C) — driving 62205-2RS home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.335 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 62205 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 62205-2RS?", "a": "The SKF 62205-2RS1 measures 25 mm bore × 52 mm OD × 18 mm width (0.984 × 2.047 × 0.709 in), mass about 130 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62205 work?", "a": "The final two digits of 62205 are bore code 05, multiplied by 5 to give 25 mm." }, { "q": "How heavy is 62205-2RS?", "a": "Catalogue mass is 130 g for 62205-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 62205-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 62205-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "4205-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×52×18 mm envelope as SKF 4205 ATN9, but catalogue C/C0 differ (14/7.8 kN vs 19/14.6 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62205-2RS", "62205-2RS1" ], "locale_variants": {} }, { "sku": "62305-2RS", "brand": "SKF", "manufacturer_designation": "62305-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 24, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.5, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 320, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62305 carries code 05 = 25 mm (code × 5). The envelope is 25×62×24 mm (0.984×2.441×0.945 in) with a 18.5 mm radial section height, C 22.5 kN, C0 11.6 kN and Pu 0.49 kN. SKF catalogues the sealed execution as 62305-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 7500 r/min, catalogue mass 320 g.", "applications": [ "fans and blowers", "agricultural equipment", "garden machinery", "textile machines" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 25 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Mount by heating the inner ring (max 120 °C) — driving 62305-2RS home through the outer ring or balls brinells the raceways.", "Contact seals make 62305-2RS slower than the open 62305 (limiting 7500 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62305-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Catalogue ratings for 62305-2RS (C 22.5 kN, C0 11.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 62305-2RS home through the outer ring or balls brinells the raceways.", "A replacement 62305 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 62305 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 62305-2RS?", "a": "The SKF 62305-2RS1 measures 25 mm bore × 62 mm OD × 24 mm width (0.984 × 2.441 × 0.945 in), mass about 320 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62305 work?", "a": "The final two digits of 62305 are bore code 05, multiplied by 5 to give 25 mm." }, { "q": "How heavy is 62305-2RS?", "a": "Catalogue mass is 320 g for 62305-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 62305-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 62305-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "4305-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×24 mm envelope as SKF 4305 ATN9, but catalogue C/C0 differ (22.5/11.6 kN vs 31.9/22.4 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62305-2RS", "62305-2RS1" ], "locale_variants": {} }, { "sku": "62-28", "brand": "SKF", "manufacturer_designation": "62/28", "series": "6200-series", "type": "deep_groove", "d_mm": 28, "D_mm": 58, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.8, "static_load_kN": 9.5, "fatigue_load_limit_kN": 0.405, "reference_speed_rpm": 26000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6200-series, the bore is written directly after the slash as 28 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 28×58×16 mm (1.102×2.283×0.63 in) with a 15.0 mm radial section height, C 16.8 kN, C0 9.5 kN and Pu 0.405 kN. The open 62/28 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 16000 r/min, catalogue mass 170 g.", "applications": [ "conveyor drives", "fans and blowers", "agricultural equipment", "garden machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Catalogue ratings for 62-28 (C 16.8 kN, C0 9.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "The fatigue load limit is 0.405 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Open 62-28 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 62-28; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 62-28 home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.405 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 62/28 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 62/28 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 62-28?", "a": "The SKF 62/28 measures 28 mm bore × 58 mm OD × 16 mm width (1.102 × 2.283 × 0.63 in), mass about 170 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 62/28?", "a": "The slash writes a bore that falls outside the two-digit code table: 62/28 means 28 mm bore. The site slug 62-28 replaces the slash with a hyphen." }, { "q": "What load can 62-28 take?", "a": "Catalogue values for 62/28: dynamic C 16.8 kN, static C0 9.5 kN, fatigue limit Pu 0.405 kN. Use C in life calculation and C0 for static checks at 28 mm bore." }, { "q": "What is the speed rating of 62-28?", "a": "SKF lists a 26000 r/min thermal reference speed and a 16000 r/min mechanical limiting speed for 62/28; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 62-28 and a same-bore 62-series bearing?", "a": "Section height differs: 62-28 has a 15 mm radial section and C 16.8 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62-28", "62/28" ], "locale_variants": {} }, { "sku": "63-28", "brand": "SKF", "manufacturer_designation": "63/28", "series": "6300-series", "type": "deep_groove", "d_mm": 28, "D_mm": 68, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 13.7, "fatigue_load_limit_kN": 0.585, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6300-series, the bore is written directly after the slash as 28 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 28×68×18 mm (1.102×2.677×0.709 in) with a 20.0 mm radial section height, C 25.1 kN, C0 13.7 kN and Pu 0.585 kN. The open 63/28 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 14000 r/min, catalogue mass 300 g.", "applications": [ "garden machinery", "textile machines", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Fillet radii must clear the 63-28 chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Mount by heating the inner ring (max 120 °C) — driving 63-28 home through the outer ring or balls brinells the raceways.", "Open 63-28 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 63-28; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 63-28 (C 25.1 kN, C0 13.7 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 63-28 home through the outer ring or balls brinells the raceways.", "A replacement 63/28 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 63-28?", "a": "The SKF 63/28 measures 28 mm bore × 68 mm OD × 18 mm width (1.102 × 2.677 × 0.709 in), mass about 300 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 63/28?", "a": "The slash writes a bore that falls outside the two-digit code table: 63/28 means 28 mm bore. The site slug 63-28 replaces the slash with a hyphen." }, { "q": "What internal clearance does 63-28 have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 63-28 be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 63-28 take?", "a": "Catalogue values for 63/28: dynamic C 25.1 kN, static C0 13.7 kN, fatigue limit Pu 0.585 kN. Use C in life calculation and C0 for static checks at 28 mm bore." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63-28", "63/28" ], "locale_variants": {} }, { "sku": "63006-2RS", "brand": "SKF", "manufacturer_designation": "63006-2RS1", "series": "63000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 19, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.3, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 63000-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 63006 carries code 06 = 30 mm (code × 5). The envelope is 30×55×19 mm (1.181×2.165×0.748 in) with a 12.5 mm radial section height, C 13.3 kN, C0 8.3 kN and Pu 0.355 kN. SKF catalogues the sealed execution as 63006-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 8000 r/min, catalogue mass 170 g.", "applications": [ "agricultural equipment", "garden machinery", "textile machines", "electric motors" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Do not preload 63006-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Fillet radii must clear the 63006-2RS chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Contact seals make 63006-2RS slower than the open 63006 (limiting 8000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 63006-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "The fatigue load limit is 0.355 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Fillet radii must clear the 63006-2RS chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 63006 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 63006 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 63006-2RS?", "a": "The SKF 63006-2RS1 measures 30 mm bore × 55 mm OD × 19 mm width (1.181 × 2.165 × 0.748 in), mass about 170 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 63006 work?", "a": "The final two digits of 63006 are bore code 06, multiplied by 5 to give 30 mm." }, { "q": "What is the difference between 63006-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 63006-2RS has a 12.5 mm radial section and C 13.3 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 63006-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 55 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 63006-2RS?", "a": "Catalogue mass is 170 g for 63006-2RS1; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63006-2RS", "63006-2RS1" ], "locale_variants": {} }, { "sku": "62206-2RS", "brand": "SKF", "manufacturer_designation": "62206-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62206 carries code 06 = 30 mm (code × 5). The envelope is 30×62×20 mm (1.181×2.441×0.787 in) with a 16.0 mm radial section height, C 19.5 kN, C0 11.2 kN and Pu 0.475 kN. SKF catalogues the sealed execution as 62206-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 7500 r/min, catalogue mass 250 g.", "applications": [ "garden machinery", "textile machines", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Fillet radii must clear the 62206-2RS chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Catalogue ratings for 62206-2RS (C 19.5 kN, C0 11.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Contact seals make 62206-2RS slower than the open 62206 (limiting 7500 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62206-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Catalogue ratings for 62206-2RS (C 19.5 kN, C0 11.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 62206-2RS home through the outer ring or balls brinells the raceways.", "A replacement 62206 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 62206-2RS?", "a": "The SKF 62206-2RS1 measures 30 mm bore × 62 mm OD × 20 mm width (1.181 × 2.441 × 0.787 in), mass about 250 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62206 work?", "a": "The final two digits of 62206 are bore code 06, multiplied by 5 to give 30 mm." }, { "q": "What internal clearance does 62206-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 62206-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 62206-2RS take?", "a": "Catalogue values for 62206-2RS1: dynamic C 19.5 kN, static C0 11.2 kN, fatigue limit Pu 0.475 kN. Use C in life calculation and C0 for static checks at 30 mm bore." } ], "cross_ref": [ { "equiv_sku": "4206-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×20 mm envelope as SKF 4206 ATN9, but catalogue C/C0 differ (19.5/11.2 kN vs 26/20.8 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62206-2RS", "62206-2RS1" ], "locale_variants": {} }, { "sku": "62306-2RS", "brand": "SKF", "manufacturer_designation": "62306-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 27, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62306 carries code 06 = 30 mm (code × 5). The envelope is 30×72×27 mm (1.181×2.835×1.063 in) with a 21.0 mm radial section height, C 28.1 kN, C0 16 kN and Pu 0.67 kN. SKF catalogues the sealed execution as 62306-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 6300 r/min, catalogue mass 500 g.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyor drives", "fans and blowers" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 62306-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62306-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Contact seals make 62306-2RS slower than the open 62306 (limiting 6300 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62306-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "The fatigue load limit is 0.67 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Fillet radii must clear the 62306-2RS chamfer so the 27 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 62306 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 62306-2RS?", "a": "The SKF 62306-2RS1 measures 30 mm bore × 72 mm OD × 27 mm width (1.181 × 2.835 × 1.063 in), mass about 500 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62306 work?", "a": "The final two digits of 62306 are bore code 06, multiplied by 5 to give 30 mm." }, { "q": "What internal clearance does 62306-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 62306-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 62306-2RS take?", "a": "Catalogue values for 62306-2RS1: dynamic C 28.1 kN, static C0 16 kN, fatigue limit Pu 0.67 kN. Use C in life calculation and C0 for static checks at 30 mm bore." } ], "cross_ref": [ { "equiv_sku": "4306-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×27 mm envelope as SKF 4306 ATN9, but catalogue C/C0 differ (28.1/16 kN vs 41/30 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62306-2RS", "62306-2RS1" ], "locale_variants": {} }, { "sku": "63007-2RS", "brand": "SKF", "manufacturer_designation": "63007-2RS1", "series": "63000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 15.9, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 220, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 63000-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 63007 carries code 07 = 35 mm (code × 5). The envelope is 35×62×20 mm (1.378×2.441×0.787 in) with a 13.5 mm radial section height, C 15.9 kN, C0 10.2 kN and Pu 0.44 kN. SKF catalogues the sealed execution as 63007-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 7000 r/min, catalogue mass 220 g.", "applications": [ "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans", "compressor drives" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "The fatigue load limit is 0.44 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Clearance suffixes follow the seal code in the designation stack (e.g. 63007-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Contact seals make 63007-2RS slower than the open 63007 (limiting 7000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 63007-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Deep-groove geometry tolerates only minutes of misalignment; if the 62 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 63007-2RS.", "Do not preload 63007-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 63007-2RS?", "a": "The SKF 63007-2RS1 measures 35 mm bore × 62 mm OD × 20 mm width (1.378 × 2.441 × 0.787 in), mass about 220 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 63007 work?", "a": "The final two digits of 63007 are bore code 07, multiplied by 5 to give 35 mm." }, { "q": "How long can a greased 63007-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 63007-2RS take?", "a": "Catalogue values for 63007-2RS1: dynamic C 15.9 kN, static C0 10.2 kN, fatigue limit Pu 0.44 kN. Use C in life calculation and C0 for static checks at 35 mm bore." }, { "q": "What is the speed rating of 63007-2RS?", "a": "SKF publishes only the 7000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63007-2RS", "63007-2RS1" ], "locale_variants": {} }, { "sku": "62207-2RS", "brand": "SKF", "manufacturer_designation": "62207-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.5, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62207 carries code 07 = 35 mm (code × 5). The envelope is 35×72×23 mm (1.378×2.835×0.906 in) with a 18.5 mm radial section height, C 25.5 kN, C0 15.3 kN and Pu 0.655 kN. SKF catalogues the sealed execution as 62207-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 6300 r/min, catalogue mass 400 g.", "applications": [ "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Do not preload 62207-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Contact seals make 62207-2RS slower than the open 62207 (limiting 6300 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62207-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Fillet radii must clear the 62207-2RS chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Assign interference to the rotating ring: on a conventional shaft-mounted 35 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 62207 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 62207-2RS?", "a": "The SKF 62207-2RS1 measures 35 mm bore × 72 mm OD × 23 mm width (1.378 × 2.835 × 0.906 in), mass about 400 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62207 work?", "a": "The final two digits of 62207 are bore code 07, multiplied by 5 to give 35 mm." }, { "q": "How long can a greased 62207-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 62207-2RS take?", "a": "Catalogue values for 62207-2RS1: dynamic C 25.5 kN, static C0 15.3 kN, fatigue limit Pu 0.655 kN. Use C in life calculation and C0 for static checks at 35 mm bore." }, { "q": "What is the speed rating of 62207-2RS?", "a": "SKF publishes only the 6300 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." } ], "cross_ref": [ { "equiv_sku": "4207-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×23 mm envelope as SKF 4207 ATN9, but catalogue C/C0 differ (25.5/15.3 kN vs 35.1/28.5 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62207-2RS", "62207-2RS1" ], "locale_variants": {} }, { "sku": "6307-M", "brand": "SKF", "manufacturer_designation": "6307 M", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 19000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6307 carries code 07 = 35 mm (code × 5). The envelope is 35×80×21 mm (1.378×3.15×0.827 in) with a 22.5 mm radial section height, C 35.1 kN, C0 19 kN and Pu 0.815 kN. The open 6307 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 17000 r/min, catalogue mass 540 g.", "applications": [ "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans", "compressor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 6307-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The fatigue load limit is 0.815 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The M suffix on 6307-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 540 g quoted mass includes the heavier cage.", "Open 6307-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6307-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6307-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "A replacement 6307 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 6307 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6307-M?", "a": "The SKF 6307 M measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 540 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6307 work?", "a": "The final two digits of 6307 are bore code 07, multiplied by 5 to give 35 mm." }, { "q": "What is the speed rating of 6307-M?", "a": "SKF lists a 19000 r/min thermal reference speed and a 17000 r/min mechanical limiting speed for 6307 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6307-M and a same-bore 62-series bearing?", "a": "Section height differs: 6307-M has a 22.5 mm radial section and C 35.1 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6307-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 80 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "W6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×21 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (35.1/19 kN vs 28.6/19 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "307", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×21 mm envelope as SKF 307, but catalogue C/C0 differ (35.1/19 kN vs 34.7/26.5 kN) — envelope match only after a load check." }, { "equiv_sku": "307-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×21 mm envelope as SKF 307-2Z, but catalogue C/C0 differ (35.1/19 kN vs 34.7/26.5 kN) — envelope match only after a load check." }, { "equiv_sku": "6307", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6307 (open arrangement) shares the 35×80×21 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6307-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6307-2Z (two non-contact shields) shares the 35×80×21 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6307-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6307-2RSH (two contact elastomer seals) shares the 35×80×21 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6307-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6307-C on the same 35×80×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6307-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6307-C-2HRS on the same 35×80×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6307-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6307-C-2Z on the same 35×80×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6307-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6307DDU on the same 35×80×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6307VV on the same 35×80×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6307-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6307ZZ on the same 35×80×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6307-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6307 on the same 35×80×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6307-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6307 on the same 35×80×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6307-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6307LLU on the same 35×80×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6307-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6307LLB on the same 35×80×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6307-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6307ZZ on the same 35×80×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6307-M", "6307 M" ], "locale_variants": {} }, { "sku": "62307-2RS", "brand": "SKF", "manufacturer_designation": "62307-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 31, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.2, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 680, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62307 carries code 07 = 35 mm (code × 5). The envelope is 35×80×31 mm (1.378×3.15×1.22 in) with a 22.5 mm radial section height, C 33.2 kN, C0 19 kN and Pu 0.815 kN. SKF catalogues the sealed execution as 62307-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 6000 r/min, catalogue mass 680 g.", "applications": [ "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 80 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62307-2RS.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62307-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Contact seals make 62307-2RS slower than the open 62307 (limiting 6000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62307-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Mount by heating the inner ring (max 120 °C) — driving 62307-2RS home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.815 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 62307 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 62307-2RS?", "a": "The SKF 62307-2RS1 measures 35 mm bore × 80 mm OD × 31 mm width (1.378 × 3.15 × 1.22 in), mass about 680 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62307 work?", "a": "The final two digits of 62307 are bore code 07, multiplied by 5 to give 35 mm." }, { "q": "What is the difference between 62307-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62307-2RS has a 22.5 mm radial section and C 33.2 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 62307-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 80 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 62307-2RS?", "a": "Catalogue mass is 680 g for 62307-2RS1; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "4307-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×31 mm envelope as SKF 4307 ATN9, but catalogue C/C0 differ (33.2/19 kN vs 50.7/38 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62307-2RS", "62307-2RS1" ], "locale_variants": {} }, { "sku": "63008-2RS", "brand": "SKF", "manufacturer_designation": "63008-2RS1", "series": "63000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 21, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 63000-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 63008 carries code 08 = 40 mm (code × 5). The envelope is 40×68×21 mm (1.575×2.677×0.827 in) with a 14.0 mm radial section height, C 16.8 kN, C0 11 kN and Pu 0.49 kN. SKF catalogues the sealed execution as 63008-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 6300 r/min, catalogue mass 270 g.", "applications": [ "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 68 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 63008-2RS.", "Fillet radii must clear the 63008-2RS chamfer so the 21 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Contact seals make 63008-2RS slower than the open 63008 (limiting 6300 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 63008-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Catalogue ratings for 63008-2RS (C 16.8 kN, C0 11 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 63008-2RS home through the outer ring or balls brinells the raceways.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 63008 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 63008-2RS?", "a": "The SKF 63008-2RS1 measures 40 mm bore × 68 mm OD × 21 mm width (1.575 × 2.677 × 0.827 in), mass about 270 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 63008 work?", "a": "The final two digits of 63008 are bore code 08, multiplied by 5 to give 40 mm." }, { "q": "What is the speed rating of 63008-2RS?", "a": "SKF publishes only the 6300 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 63008-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 63008-2RS has a 14 mm radial section and C 16.8 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 63008-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 68 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63008-2RS", "63008-2RS1" ], "locale_variants": {} }, { "sku": "62208-2RS", "brand": "SKF", "manufacturer_designation": "62208-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 30.7, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62208 carries code 08 = 40 mm (code × 5). The envelope is 40×80×23 mm (1.575×3.15×0.906 in) with a 20.0 mm radial section height, C 30.7 kN, C0 19 kN and Pu 0.8 kN. SKF catalogues the sealed execution as 62208-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 5600 r/min, catalogue mass 470 g.", "applications": [ "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 62208-2RS home through the outer ring or balls brinells the raceways.", "Assign interference to the rotating ring: on a conventional shaft-mounted 40 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Contact seals make 62208-2RS slower than the open 62208 (limiting 5600 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62208-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "At 40 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 62208-2RS (C 30.7 kN, C0 19 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "A replacement 62208 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 62208-2RS?", "a": "The SKF 62208-2RS1 measures 40 mm bore × 80 mm OD × 23 mm width (1.575 × 3.15 × 0.906 in), mass about 470 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62208 work?", "a": "The final two digits of 62208 are bore code 08, multiplied by 5 to give 40 mm." }, { "q": "What load can 62208-2RS take?", "a": "Catalogue values for 62208-2RS1: dynamic C 30.7 kN, static C0 19 kN, fatigue limit Pu 0.8 kN. Use C in life calculation and C0 for static checks at 40 mm bore." }, { "q": "What is the speed rating of 62208-2RS?", "a": "SKF publishes only the 5600 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 62208-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62208-2RS has a 20 mm radial section and C 30.7 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "4208-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×23 mm envelope as SKF 4208 ATN9, but catalogue C/C0 differ (30.7/19 kN vs 37.1/32.5 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62208-2RS", "62208-2RS1" ], "locale_variants": {} }, { "sku": "62308-2RS", "brand": "SKF", "manufacturer_designation": "62308-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 920, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62308 carries code 08 = 40 mm (code × 5). The envelope is 40×90×33 mm (1.575×3.543×1.299 in) with a 25.0 mm radial section height, C 41 kN, C0 24 kN and Pu 1.02 kN. SKF catalogues the sealed execution as 62308-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 5000 r/min, catalogue mass 920 g.", "applications": [ "material-handling equipment", "industrial fans", "compressor drives", "machine tool auxiliaries" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Catalogue ratings for 62308-2RS (C 41 kN, C0 24 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "At 40 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Contact seals make 62308-2RS slower than the open 62308 (limiting 5000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62308-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Assign interference to the rotating ring: on a conventional shaft-mounted 40 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Deep-groove geometry tolerates only minutes of misalignment; if the 90 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62308-2RS.", "Where two 62308 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 62308 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 62308-2RS?", "a": "The SKF 62308-2RS1 measures 40 mm bore × 90 mm OD × 33 mm width (1.575 × 3.543 × 1.299 in), mass about 920 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62308 work?", "a": "The final two digits of 62308 are bore code 08, multiplied by 5 to give 40 mm." }, { "q": "Which fits should I use for 62308-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 90 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 62308-2RS?", "a": "Catalogue mass is 920 g for 62308-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 62308-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "4308-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×33 mm envelope as SKF 4308 ATN9, but catalogue C/C0 differ (41/24 kN vs 55.9/45 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62308-2RS", "62308-2RS1" ], "locale_variants": {} }, { "sku": "63009-2RS", "brand": "SKF", "manufacturer_designation": "63009-2RS1", "series": "63000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 23, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 360, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 63000-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 63009 carries code 09 = 45 mm (code × 5). The envelope is 45×75×23 mm (1.772×2.953×0.906 in) with a 15.0 mm radial section height, C 20.8 kN, C0 14.6 kN and Pu 0.64 kN. SKF catalogues the sealed execution as 63009-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 5600 r/min, catalogue mass 360 g.", "applications": [ "industrial fans", "compressor drives", "machine tool auxiliaries", "agricultural gearboxes" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "The fatigue load limit is 0.64 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Clearance suffixes follow the seal code in the designation stack (e.g. 63009-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Contact seals make 63009-2RS slower than the open 63009 (limiting 5600 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 63009-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Mount by heating the inner ring (max 120 °C) — driving 63009-2RS home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.64 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 63009 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 63009-2RS?", "a": "The SKF 63009-2RS1 measures 45 mm bore × 75 mm OD × 23 mm width (1.772 × 2.953 × 0.906 in), mass about 360 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 63009 work?", "a": "The final two digits of 63009 are bore code 09, multiplied by 5 to give 45 mm." }, { "q": "How heavy is 63009-2RS?", "a": "Catalogue mass is 360 g for 63009-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 63009-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 63009-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63009-2RS", "63009-2RS1" ], "locale_variants": {} }, { "sku": "62209-2RS", "brand": "SKF", "manufacturer_designation": "62209-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.2, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.915, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 510, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62209 carries code 09 = 45 mm (code × 5). The envelope is 45×85×23 mm (1.772×3.346×0.906 in) with a 20.0 mm radial section height, C 33.2 kN, C0 21.6 kN and Pu 0.915 kN. SKF catalogues the sealed execution as 62209-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 5000 r/min, catalogue mass 510 g.", "applications": [ "material-handling equipment", "industrial fans", "compressor drives", "machine tool auxiliaries" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 62209-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62209-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Contact seals make 62209-2RS slower than the open 62209 (limiting 5000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62209-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Deep-groove geometry tolerates only minutes of misalignment; if the 85 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62209-2RS.", "Do not preload 62209-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 62209 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 62209-2RS?", "a": "The SKF 62209-2RS1 measures 45 mm bore × 85 mm OD × 23 mm width (1.772 × 3.346 × 0.906 in), mass about 510 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62209 work?", "a": "The final two digits of 62209 are bore code 09, multiplied by 5 to give 45 mm." }, { "q": "Which fits should I use for 62209-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 85 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 62209-2RS?", "a": "Catalogue mass is 510 g for 62209-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 62209-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "4209-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope as SKF 4209 ATN9, but catalogue C/C0 differ (33.2/21.6 kN vs 39/36 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62209-2RS", "62209-2RS1" ], "locale_variants": {} }, { "sku": "6309-M", "brand": "SKF", "manufacturer_designation": "6309 M", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 15000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6309 carries code 09 = 45 mm (code × 5). The envelope is 45×100×25 mm (1.772×3.937×0.984 in) with a 27.5 mm radial section height, C 55.3 kN, C0 31.5 kN and Pu 1.34 kN. The open 6309 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 14000 r/min, catalogue mass 850 g.", "applications": [ "industrial fans", "compressor drives", "machine tool auxiliaries", "agricultural gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "The fatigue load limit is 1.34 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Do not preload 6309-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6309-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 850 g quoted mass includes the heavier cage.", "Open 6309-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6309-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 6309-M chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6309-M?", "a": "The SKF 6309 M measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 850 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6309 work?", "a": "The final two digits of 6309 are bore code 09, multiplied by 5 to give 45 mm." }, { "q": "How long can a greased 6309-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6309-M take?", "a": "Catalogue values for 6309 M: dynamic C 55.3 kN, static C0 31.5 kN, fatigue limit Pu 1.34 kN. Use C in life calculation and C0 for static checks at 45 mm bore." }, { "q": "What is the speed rating of 6309-M?", "a": "SKF lists a 15000 r/min thermal reference speed and a 14000 r/min mechanical limiting speed for 6309 M; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "309", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope as SKF 309, but catalogue C/C0 differ (55.3/31.5 kN vs 55/44 kN) — envelope match only after a load check." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope as SKF 309-2Z, but catalogue C/C0 differ (55.3/31.5 kN vs 55/44 kN) — envelope match only after a load check." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6309 (open arrangement) shares the 45×100×25 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6309-2Z (two non-contact shields) shares the 45×100×25 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6309-2RSH (two contact elastomer seals) shares the 45×100×25 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6309DDU on the same 45×100×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6309VV on the same 45×100×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6309ZZ on the same 45×100×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6309 on the same 45×100×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6309-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6309 on the same 45×100×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6309-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6309LLU on the same 45×100×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6309-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6309LLB on the same 45×100×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6309-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6309ZZ on the same 45×100×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6309-M", "6309 M" ], "locale_variants": {} }, { "sku": "62309-2RS", "brand": "SKF", "manufacturer_designation": "62309-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 52.7, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62309 carries code 09 = 45 mm (code × 5). The envelope is 45×100×36 mm (1.772×3.937×1.417 in) with a 27.5 mm radial section height, C 52.7 kN, C0 31.5 kN and Pu 1.34 kN. SKF catalogues the sealed execution as 62309-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 4500 r/min, catalogue mass 1200 g.", "applications": [ "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Do not preload 62309-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62309-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Contact seals make 62309-2RS slower than the open 62309 (limiting 4500 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62309-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62309-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "At 45 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 62309-2RS?", "a": "The SKF 62309-2RS1 measures 45 mm bore × 100 mm OD × 36 mm width (1.772 × 3.937 × 1.417 in), mass about 1200 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62309 work?", "a": "The final two digits of 62309 are bore code 09, multiplied by 5 to give 45 mm." }, { "q": "What is the difference between 62309-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62309-2RS has a 27.5 mm radial section and C 52.7 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 62309-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 100 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 62309-2RS?", "a": "Catalogue mass is 1200 g for 62309-2RS1; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "4309-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×36 mm envelope as SKF 4309 ATN9, but catalogue C/C0 differ (52.7/31.5 kN vs 68.9/56 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62309-2RS", "62309-2RS1" ], "locale_variants": {} }, { "sku": "63010-2RS", "brand": "SKF", "manufacturer_designation": "63010-2RS1", "series": "63000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.6, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 63000-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 63010 carries code 10 = 50 mm (code × 5). The envelope is 50×80×23 mm (1.969×3.15×0.906 in) with a 15.0 mm radial section height, C 21.6 kN, C0 15.6 kN and Pu 0.71 kN. SKF catalogues the sealed execution as 63010-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 5000 r/min, catalogue mass 380 g.", "applications": [ "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans", "compressor drives" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Clearance suffixes follow the seal code in the designation stack (e.g. 63010-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Contact seals make 63010-2RS slower than the open 63010 (limiting 5000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 63010-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 63010-2RS (C 21.6 kN, C0 15.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 63010-2RS?", "a": "The SKF 63010-2RS1 measures 50 mm bore × 80 mm OD × 23 mm width (1.969 × 3.15 × 0.906 in), mass about 380 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 63010 work?", "a": "The final two digits of 63010 are bore code 10, multiplied by 5 to give 50 mm." }, { "q": "What is the speed rating of 63010-2RS?", "a": "SKF publishes only the 5000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 63010-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 63010-2RS has a 15 mm radial section and C 21.6 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 63010-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 80 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "63010-2RS", "63010-2RS1" ], "locale_variants": {} }, { "sku": "6210-M", "brand": "SKF", "manufacturer_designation": "6210 M", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6210 carries code 10 = 50 mm (code × 5). The envelope is 50×90×20 mm (1.969×3.543×0.787 in) with a 20.0 mm radial section height, C 37.1 kN, C0 23.2 kN and Pu 0.98 kN. The open 6210 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 14000 r/min, catalogue mass 520 g.", "applications": [ "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "The fatigue load limit is 0.98 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Catalogue ratings for 6210-M (C 37.1 kN, C0 23.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "The M suffix on 6210-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 520 g quoted mass includes the heavier cage.", "Open 6210-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6210-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 0.98 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 6210 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6210-M?", "a": "The SKF 6210 M measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 520 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6210 work?", "a": "The final two digits of 6210 are bore code 10, multiplied by 5 to give 50 mm." }, { "q": "How heavy is 6210-M?", "a": "Catalogue mass is 520 g for 6210 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6210-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6210-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (37.1/23.2 kN vs 30.2/23.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (37.1/23.2 kN vs 30.2/23.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope as SKF 210, but catalogue C/C0 differ (37.1/23.2 kN vs 39.1/34.5 kN) — envelope match only after a load check." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope as SKF 210-2Z, but catalogue C/C0 differ (37.1/23.2 kN vs 39.1/34.5 kN) — envelope match only after a load check." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6210 (open arrangement) shares the 50×90×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6210-2Z (two non-contact shields) shares the 50×90×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6210-2RSH (two contact elastomer seals) shares the 50×90×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6210DDU on the same 50×90×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6210VV on the same 50×90×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6210ZZ on the same 50×90×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6210 on the same 50×90×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6210-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6210 on the same 50×90×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6210-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6210LLU on the same 50×90×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6210-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6210LLB on the same 50×90×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6210-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6210ZZ on the same 50×90×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6210-M", "6210 M" ], "locale_variants": {} }, { "sku": "62210-2RS", "brand": "SKF", "manufacturer_designation": "62210-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 35.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62210 carries code 10 = 50 mm (code × 5). The envelope is 50×90×23 mm (1.969×3.543×0.906 in) with a 20.0 mm radial section height, C 35.1 kN, C0 23.2 kN and Pu 0.98 kN. SKF catalogues the sealed execution as 62210-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 4800 r/min, catalogue mass 540 g.", "applications": [ "compressor drives", "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Catalogue ratings for 62210-2RS (C 35.1 kN, C0 23.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Catalogue ratings for 62210-2RS (C 35.1 kN, C0 23.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Contact seals make 62210-2RS slower than the open 62210 (limiting 4800 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62210-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 62210-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62210-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "For positions that need relubrication, choose the open execution of 62210 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 62210-2RS?", "a": "The SKF 62210-2RS1 measures 50 mm bore × 90 mm OD × 23 mm width (1.969 × 3.543 × 0.906 in), mass about 540 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62210 work?", "a": "The final two digits of 62210 are bore code 10, multiplied by 5 to give 50 mm." }, { "q": "How long can a greased 62210-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 62210-2RS take?", "a": "Catalogue values for 62210-2RS1: dynamic C 35.1 kN, static C0 23.2 kN, fatigue limit Pu 0.98 kN. Use C in life calculation and C0 for static checks at 50 mm bore." }, { "q": "What is the speed rating of 62210-2RS?", "a": "SKF publishes only the 4800 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." } ], "cross_ref": [ { "equiv_sku": "4210-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×23 mm envelope as SKF 4210 ATN9, but catalogue C/C0 differ (35.1/23.2 kN vs 41/40 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62210-2RS", "62210-2RS1" ], "locale_variants": {} }, { "sku": "6310-M", "brand": "SKF", "manufacturer_designation": "6310 M", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6310 carries code 10 = 50 mm (code × 5). The envelope is 50×110×27 mm (1.969×4.331×1.063 in) with a 30.0 mm radial section height, C 65 kN, C0 38 kN and Pu 1.6 kN. The open 6310 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 8500 r/min, catalogue mass 1300 g.", "applications": [ "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 110 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6310-M.", "Assign interference to the rotating ring: on a conventional shaft-mounted 50 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "The M suffix on 6310-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1300 g quoted mass includes the heavier cage.", "Open 6310-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6310-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 110 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6310-M.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 6310 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6310-M?", "a": "The SKF 6310 M measures 50 mm bore × 110 mm OD × 27 mm width (1.969 × 4.331 × 1.063 in), mass about 1300 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6310 work?", "a": "The final two digits of 6310 are bore code 10, multiplied by 5 to give 50 mm." }, { "q": "What is the speed rating of 6310-M?", "a": "SKF lists a 13000 r/min thermal reference speed and a 8500 r/min mechanical limiting speed for 6310 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6310-M and a same-bore 62-series bearing?", "a": "Section height differs: 6310-M has a 30 mm radial section and C 65 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6310-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 110 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "310", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope as SKF 310, but catalogue C/C0 differ (65/38 kN vs 64.4/52 kN) — envelope match only after a load check." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope as SKF 310-2Z, but catalogue C/C0 differ (65/38 kN vs 64.4/52 kN) — envelope match only after a load check." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6310 (open arrangement) shares the 50×110×27 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6310-2Z (two non-contact shields) shares the 50×110×27 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6310-2RSH (two contact elastomer seals) shares the 50×110×27 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6310DDU on the same 50×110×27 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6310VV on the same 50×110×27 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6310ZZ on the same 50×110×27 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6310 on the same 50×110×27 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6310-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6310 on the same 50×110×27 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6310-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6310LLU on the same 50×110×27 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6310-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6310LLB on the same 50×110×27 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6310-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6310ZZ on the same 50×110×27 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6310-M", "6310 M" ], "locale_variants": {} }, { "sku": "62310-2RS", "brand": "SKF", "manufacturer_designation": "62310-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 61.8, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62310 carries code 10 = 50 mm (code × 5). The envelope is 50×110×40 mm (1.969×4.331×1.575 in) with a 30.0 mm radial section height, C 61.8 kN, C0 38 kN and Pu 1.6 kN. SKF catalogues the sealed execution as 62310-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 4300 r/min, catalogue mass 1600 g.", "applications": [ "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 62310-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Fillet radii must clear the 62310-2RS chamfer so the 40 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Contact seals make 62310-2RS slower than the open 62310 (limiting 4300 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62310-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 62310-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62310-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "A replacement 62310 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 62310 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 62310-2RS?", "a": "The SKF 62310-2RS1 measures 50 mm bore × 110 mm OD × 40 mm width (1.969 × 4.331 × 1.575 in), mass about 1600 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62310 work?", "a": "The final two digits of 62310 are bore code 10, multiplied by 5 to give 50 mm." }, { "q": "What internal clearance does 62310-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 62310-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 62310-2RS take?", "a": "Catalogue values for 62310-2RS1: dynamic C 61.8 kN, static C0 38 kN, fatigue limit Pu 1.6 kN. Use C in life calculation and C0 for static checks at 50 mm bore." } ], "cross_ref": [ { "equiv_sku": "4310-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×40 mm envelope as SKF 4310 ATN9, but catalogue C/C0 differ (61.8/38 kN vs 81.9/69.5 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62310-2RS", "62310-2RS1" ], "locale_variants": {} }, { "sku": "6011-M", "brand": "SKF", "manufacturer_designation": "6011 M", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 16000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6011 carries code 11 = 55 mm (code × 5). The envelope is 55×90×18 mm (2.165×3.543×0.709 in) with a 17.5 mm radial section height, C 29.6 kN, C0 21.2 kN and Pu 0.9 kN. The open 6011 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 14000 r/min, catalogue mass 440 g.", "applications": [ "industrial fans", "compressor drives", "machine tool auxiliaries", "agricultural gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 90 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6011-M.", "Fillet radii must clear the 6011-M chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6011-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 440 g quoted mass includes the heavier cage.", "Open 6011-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6011-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 6011-M home through the outer ring or balls brinells the raceways.", "A replacement 6011 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6011-M?", "a": "The SKF 6011 M measures 55 mm bore × 90 mm OD × 18 mm width (2.165 × 3.543 × 0.709 in), mass about 440 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6011 work?", "a": "The final two digits of 6011 are bore code 11, multiplied by 5 to give 55 mm." }, { "q": "How long can a greased 6011-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6011-M take?", "a": "Catalogue values for 6011 M: dynamic C 29.6 kN, static C0 21.2 kN, fatigue limit Pu 0.9 kN. Use C in life calculation and C0 for static checks at 55 mm bore." }, { "q": "What is the speed rating of 6011-M?", "a": "SKF lists a 16000 r/min thermal reference speed and a 14000 r/min mechanical limiting speed for 6011 M; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "6011", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6011 (open arrangement) shares the 55×90×18 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6011-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6011-2Z (two non-contact shields) shares the 55×90×18 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6011-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6011-2RS1 (two contact elastomer seals) shares the 55×90×18 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6011-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6011 on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6011-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6011-2RSR on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6011-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6011-2Z on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6011-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6011DDU on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6011VV on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6011-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6011ZZ on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6011-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6011 on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6011-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6011 on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6011-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6011LLU on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6011-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6011LLB on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6011-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6011ZZ on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6011-M", "6011 M" ], "locale_variants": {} }, { "sku": "6211-M", "brand": "SKF", "manufacturer_designation": "6211 M", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 14000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6211 carries code 11 = 55 mm (code × 5). The envelope is 55×100×21 mm (2.165×3.937×0.827 in) with a 22.5 mm radial section height, C 46.2 kN, C0 29 kN and Pu 1.25 kN. The open 6211 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 13000 r/min, catalogue mass 720 g.", "applications": [ "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans", "compressor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 55 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "The fatigue load limit is 1.25 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The M suffix on 6211-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 720 g quoted mass includes the heavier cage.", "Open 6211-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6211-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 6211-M home through the outer ring or balls brinells the raceways.", "A replacement 6211 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 6211 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6211-M?", "a": "The SKF 6211 M measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 720 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6211 work?", "a": "The final two digits of 6211 are bore code 11, multiplied by 5 to give 55 mm." }, { "q": "What load can 6211-M take?", "a": "Catalogue values for 6211 M: dynamic C 46.2 kN, static C0 29 kN, fatigue limit Pu 1.25 kN. Use C in life calculation and C0 for static checks at 55 mm bore." }, { "q": "What is the speed rating of 6211-M?", "a": "SKF lists a 14000 r/min thermal reference speed and a 13000 r/min mechanical limiting speed for 6211 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6211-M and a same-bore 62-series bearing?", "a": "Section height differs: 6211-M has a 22.5 mm radial section and C 46.2 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope as SKF 211, but catalogue C/C0 differ (46.2/29 kN vs 48.4/44 kN) — envelope match only after a load check." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope as SKF 211-2Z, but catalogue C/C0 differ (46.2/29 kN vs 48.4/44 kN) — envelope match only after a load check." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6211 (open arrangement) shares the 55×100×21 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6211-2Z (two non-contact shields) shares the 55×100×21 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6211-2RSH (two contact elastomer seals) shares the 55×100×21 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6211-C on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6211-C-2HRS on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6211-C-2Z on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6211DDU on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6211VV on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6211ZZ on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6211 on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6211-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6211 on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6211-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6211LLU on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6211-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6211LLB on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6211-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6211ZZ on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6211-M", "6211 M" ], "locale_variants": {} }, { "sku": "62211-2RS", "brand": "SKF", "manufacturer_designation": "62211-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 43.6, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62211 carries code 11 = 55 mm (code × 5). The envelope is 55×100×25 mm (2.165×3.937×0.984 in) with a 22.5 mm radial section height, C 43.6 kN, C0 29 kN and Pu 1.25 kN. SKF catalogues the sealed execution as 62211-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 4300 r/min, catalogue mass 750 g.", "applications": [ "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans", "compressor drives" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 100 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62211-2RS.", "At 55 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Contact seals make 62211-2RS slower than the open 62211 (limiting 4300 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62211-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Catalogue ratings for 62211-2RS (C 43.6 kN, C0 29 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 62211-2RS home through the outer ring or balls brinells the raceways.", "A replacement 62211 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 62211-2RS?", "a": "The SKF 62211-2RS1 measures 55 mm bore × 100 mm OD × 25 mm width (2.165 × 3.937 × 0.984 in), mass about 750 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62211 work?", "a": "The final two digits of 62211 are bore code 11, multiplied by 5 to give 55 mm." }, { "q": "Which fits should I use for 62211-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 100 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 62211-2RS?", "a": "Catalogue mass is 750 g for 62211-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 62211-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "4211-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope as SKF 4211 ATN9, but catalogue C/C0 differ (43.6/29 kN vs 44.9/44 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62211-2RS", "62211-2RS1" ], "locale_variants": {} }, { "sku": "6311-M", "brand": "SKF", "manufacturer_designation": "6311 M", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 12000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 1650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6311 carries code 11 = 55 mm (code × 5). The envelope is 55×120×29 mm (2.165×4.724×1.142 in) with a 32.5 mm radial section height, C 74.1 kN, C0 45 kN and Pu 1.9 kN. The open 6311 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 11000 r/min, catalogue mass 1650 g.", "applications": [ "compressor drives", "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Fillet radii must clear the 6311-M chamfer so the 29 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Do not preload 6311-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6311-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1650 g quoted mass includes the heavier cage.", "Open 6311-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6311-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 6311-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 6311 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 6311 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 6311-M?", "a": "The SKF 6311 M measures 55 mm bore × 120 mm OD × 29 mm width (2.165 × 4.724 × 1.142 in), mass about 1650 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6311 work?", "a": "The final two digits of 6311 are bore code 11, multiplied by 5 to give 55 mm." }, { "q": "How long can a greased 6311-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6311-M take?", "a": "Catalogue values for 6311 M: dynamic C 74.1 kN, static C0 45 kN, fatigue limit Pu 1.9 kN. Use C in life calculation and C0 for static checks at 55 mm bore." }, { "q": "What is the speed rating of 6311-M?", "a": "SKF lists a 12000 r/min thermal reference speed and a 11000 r/min mechanical limiting speed for 6311 M; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "311", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope as SKF 311, but catalogue C/C0 differ (74.1/45 kN vs 79.2/67 kN) — envelope match only after a load check." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope as SKF 311-2Z, but catalogue C/C0 differ (74.1/45 kN vs 79.2/67 kN) — envelope match only after a load check." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6311 (open arrangement) shares the 55×120×29 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6311-2Z (two non-contact shields) shares the 55×120×29 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6311-2RSH (two contact elastomer seals) shares the 55×120×29 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6311-C on the same 55×120×29 mm envelope, but catalogue C/C0 differ (74.1/45 kN vs 83/47.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6311-C-2HRS on the same 55×120×29 mm envelope, but catalogue C/C0 differ (74.1/45 kN vs 83/47.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6311-C-2Z on the same 55×120×29 mm envelope, but catalogue C/C0 differ (74.1/45 kN vs 83/47.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6311DDU on the same 55×120×29 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6311VV on the same 55×120×29 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6311ZZ on the same 55×120×29 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6311 on the same 55×120×29 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6311-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6311 on the same 55×120×29 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6311-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6311LLU on the same 55×120×29 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6311-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6311LLB on the same 55×120×29 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6311-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6311ZZ on the same 55×120×29 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6311-M", "6311 M" ], "locale_variants": {} }, { "sku": "62311-2RS", "brand": "SKF", "manufacturer_designation": "62311-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 71.5, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 2050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62311 carries code 11 = 55 mm (code × 5). The envelope is 55×120×43 mm (2.165×4.724×1.693 in) with a 32.5 mm radial section height, C 71.5 kN, C0 45 kN and Pu 1.9 kN. SKF catalogues the sealed execution as 62311-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 3800 r/min, catalogue mass 2050 g.", "applications": [ "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 55 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Assign interference to the rotating ring: on a conventional shaft-mounted 55 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Contact seals make 62311-2RS slower than the open 62311 (limiting 3800 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62311-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Assign interference to the rotating ring: on a conventional shaft-mounted 55 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Deep-groove geometry tolerates only minutes of misalignment; if the 120 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62311-2RS.", "Where two 62311 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 62311-2RS?", "a": "The SKF 62311-2RS1 measures 55 mm bore × 120 mm OD × 43 mm width (2.165 × 4.724 × 1.693 in), mass about 2050 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62311 work?", "a": "The final two digits of 62311 are bore code 11, multiplied by 5 to give 55 mm." }, { "q": "What is the speed rating of 62311-2RS?", "a": "SKF publishes only the 3800 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 62311-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62311-2RS has a 32.5 mm radial section and C 71.5 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 62311-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 120 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "4311-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×43 mm envelope as SKF 4311 ATN9, but catalogue C/C0 differ (71.5/45 kN vs 97.5/83 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62311-2RS", "62311-2RS1" ], "locale_variants": {} }, { "sku": "6212-M", "brand": "SKF", "manufacturer_designation": "6212 M", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6212 carries code 12 = 60 mm (code × 5). The envelope is 60×110×22 mm (2.362×4.331×0.866 in) with a 25.0 mm radial section height, C 55.3 kN, C0 36 kN and Pu 1.53 kN. The open 6212 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 8000 r/min, catalogue mass 930 g.", "applications": [ "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Do not preload 6212-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Deep-groove geometry tolerates only minutes of misalignment; if the 110 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6212-M.", "The M suffix on 6212-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 930 g quoted mass includes the heavier cage.", "Open 6212-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6212-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 6212-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 6212 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 6212 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 6212-M?", "a": "The SKF 6212 M measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 930 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6212 work?", "a": "The final two digits of 6212 are bore code 12, multiplied by 5 to give 60 mm." }, { "q": "What load can 6212-M take?", "a": "Catalogue values for 6212 M: dynamic C 55.3 kN, static C0 36 kN, fatigue limit Pu 1.53 kN. Use C in life calculation and C0 for static checks at 60 mm bore." }, { "q": "What is the speed rating of 6212-M?", "a": "SKF lists a 13000 r/min thermal reference speed and a 8000 r/min mechanical limiting speed for 6212 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6212-M and a same-bore 62-series bearing?", "a": "Section height differs: 6212-M has a 25 mm radial section and C 55.3 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope as SKF 212, but catalogue C/C0 differ (55.3/36 kN vs 56.1/50 kN) — envelope match only after a load check." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope as SKF 212-2Z, but catalogue C/C0 differ (55.3/36 kN vs 56.1/50 kN) — envelope match only after a load check." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6212 (open arrangement) shares the 60×110×22 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6212-2Z (two non-contact shields) shares the 60×110×22 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6212-2RSH (two contact elastomer seals) shares the 60×110×22 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6212DDU on the same 60×110×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6212VV on the same 60×110×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6212ZZ on the same 60×110×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6212 on the same 60×110×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6212-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6212 on the same 60×110×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6212-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6212LLU on the same 60×110×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6212-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6212LLB on the same 60×110×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6212-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6212ZZ on the same 60×110×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6212-M", "6212 M" ], "locale_variants": {} }, { "sku": "62212-2RS", "brand": "SKF", "manufacturer_designation": "62212-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 52.7, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 1000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62212 carries code 12 = 60 mm (code × 5). The envelope is 60×110×28 mm (2.362×4.331×1.102 in) with a 25.0 mm radial section height, C 52.7 kN, C0 36 kN and Pu 1.53 kN. SKF catalogues the sealed execution as 62212-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 4000 r/min, catalogue mass 1000 g.", "applications": [ "material-handling equipment", "industrial fans", "compressor drives", "machine tool auxiliaries" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 62212-2RS home through the outer ring or balls brinells the raceways.", "Do not preload 62212-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Contact seals make 62212-2RS slower than the open 62212 (limiting 4000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62212-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "At 60 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Catalogue ratings for 62212-2RS (C 52.7 kN, C0 36 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "For positions that need relubrication, choose the open execution of 62212 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 62212-2RS?", "a": "The SKF 62212-2RS1 measures 60 mm bore × 110 mm OD × 28 mm width (2.362 × 4.331 × 1.102 in), mass about 1000 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62212 work?", "a": "The final two digits of 62212 are bore code 12, multiplied by 5 to give 60 mm." }, { "q": "How long can a greased 62212-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 62212-2RS take?", "a": "Catalogue values for 62212-2RS1: dynamic C 52.7 kN, static C0 36 kN, fatigue limit Pu 1.53 kN. Use C in life calculation and C0 for static checks at 60 mm bore." }, { "q": "What is the speed rating of 62212-2RS?", "a": "SKF publishes only the 4000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." } ], "cross_ref": [ { "equiv_sku": "4212-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope as SKF 4212 ATN9, but catalogue C/C0 differ (52.7/36 kN vs 57.2/55 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62212-2RS", "62212-2RS1" ], "locale_variants": {} }, { "sku": "6312-M", "brand": "SKF", "manufacturer_designation": "6312 M", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 2100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6312 carries code 12 = 60 mm (code × 5). The envelope is 60×130×31 mm (2.362×5.118×1.22 in) with a 35.0 mm radial section height, C 85.2 kN, C0 52 kN and Pu 2.2 kN. The open 6312 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 7000 r/min, catalogue mass 2100 g.", "applications": [ "industrial fans", "compressor drives", "machine tool auxiliaries", "agricultural gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "At 60 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6312-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The M suffix on 6312-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 2100 g quoted mass includes the heavier cage.", "Open 6312-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6312-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 2.2 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 6312 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6312-M?", "a": "The SKF 6312 M measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 2100 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6312 work?", "a": "The final two digits of 6312 are bore code 12, multiplied by 5 to give 60 mm." }, { "q": "Which fits should I use for 6312-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 130 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6312-M?", "a": "Catalogue mass is 2100 g for 6312 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6312-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "312", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope as SKF 312, but catalogue C/C0 differ (85.2/52 kN vs 91.3/78 kN) — envelope match only after a load check." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope as SKF 312-2Z, but catalogue C/C0 differ (85.2/52 kN vs 91.3/78 kN) — envelope match only after a load check." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6312 (open arrangement) shares the 60×130×31 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6312-2Z (two non-contact shields) shares the 60×130×31 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6312-2RSH (two contact elastomer seals) shares the 60×130×31 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6312DDU on the same 60×130×31 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6312VV on the same 60×130×31 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6312ZZ on the same 60×130×31 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6312 on the same 60×130×31 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6312-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6312 on the same 60×130×31 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6312-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6312LLU on the same 60×130×31 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6312-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6312LLB on the same 60×130×31 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6312-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6312ZZ on the same 60×130×31 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6312-M", "6312 M" ], "locale_variants": {} }, { "sku": "62312-2RS", "brand": "SKF", "manufacturer_designation": "62312-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 81.9, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 2550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62312 carries code 12 = 60 mm (code × 5). The envelope is 60×130×46 mm (2.362×5.118×1.811 in) with a 35.0 mm radial section height, C 81.9 kN, C0 52 kN and Pu 2.2 kN. SKF catalogues the sealed execution as 62312-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 3400 r/min, catalogue mass 2550 g.", "applications": [ "industrial fans", "compressor drives", "machine tool auxiliaries", "agricultural gearboxes" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Catalogue ratings for 62312-2RS (C 81.9 kN, C0 52 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Fillet radii must clear the 62312-2RS chamfer so the 46 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Contact seals make 62312-2RS slower than the open 62312 (limiting 3400 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62312-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Catalogue ratings for 62312-2RS (C 81.9 kN, C0 52 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 62312-2RS home through the outer ring or balls brinells the raceways.", "A replacement 62312 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 62312-2RS?", "a": "The SKF 62312-2RS1 measures 60 mm bore × 130 mm OD × 46 mm width (2.362 × 5.118 × 1.811 in), mass about 2550 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62312 work?", "a": "The final two digits of 62312 are bore code 12, multiplied by 5 to give 60 mm." }, { "q": "What is the speed rating of 62312-2RS?", "a": "SKF publishes only the 3400 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 62312-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62312-2RS has a 35 mm radial section and C 81.9 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 62312-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 130 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "4312-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×46 mm envelope as SKF 4312 ATN9, but catalogue C/C0 differ (81.9/52 kN vs 112/98 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62312-2RS", "62312-2RS1" ], "locale_variants": {} }, { "sku": "6013-M", "brand": "SKF", "manufacturer_designation": "6013 M", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "reference_speed_rpm": 14000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6013 carries code 13 = 65 mm (code × 5). The envelope is 65×100×18 mm (2.559×3.937×0.709 in) with a 17.5 mm radial section height, C 31.9 kN, C0 25 kN and Pu 1.06 kN. The open 6013 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 12000 r/min, catalogue mass 440 g.", "applications": [ "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 6013-M home through the outer ring or balls brinells the raceways.", "Catalogue ratings for 6013-M (C 31.9 kN, C0 25 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "The M suffix on 6013-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 440 g quoted mass includes the heavier cage.", "Open 6013-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6013-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 6013-M (C 31.9 kN, C0 25 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "A replacement 6013 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 6013-M?", "a": "The SKF 6013 M measures 65 mm bore × 100 mm OD × 18 mm width (2.559 × 3.937 × 0.709 in), mass about 440 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6013 work?", "a": "The final two digits of 6013 are bore code 13, multiplied by 5 to give 65 mm." }, { "q": "What load can 6013-M take?", "a": "Catalogue values for 6013 M: dynamic C 31.9 kN, static C0 25 kN, fatigue limit Pu 1.06 kN. Use C in life calculation and C0 for static checks at 65 mm bore." }, { "q": "What is the speed rating of 6013-M?", "a": "SKF lists a 14000 r/min thermal reference speed and a 12000 r/min mechanical limiting speed for 6013 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6013-M and a same-bore 62-series bearing?", "a": "Section height differs: 6013-M has a 17.5 mm radial section and C 31.9 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "6013", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6013 (open arrangement) shares the 65×100×18 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6013-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6013-2Z (two non-contact shields) shares the 65×100×18 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6013-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6013-2RS1 (two contact elastomer seals) shares the 65×100×18 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6013-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6013DDU on the same 65×100×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6013VV on the same 65×100×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6013-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6013ZZ on the same 65×100×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6013-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6013 on the same 65×100×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6013-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6013 on the same 65×100×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6013-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6013LLU on the same 65×100×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6013-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6013LLB on the same 65×100×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6013-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6013ZZ on the same 65×100×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6013-M", "6013 M" ], "locale_variants": {} }, { "sku": "6213-M", "brand": "SKF", "manufacturer_designation": "6213 M", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 58.5, "static_load_kN": 40.5, "fatigue_load_limit_kN": 1.73, "reference_speed_rpm": 12000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 1200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6213 carries code 13 = 65 mm (code × 5). The envelope is 65×120×23 mm (2.559×4.724×0.906 in) with a 27.5 mm radial section height, C 58.5 kN, C0 40.5 kN and Pu 1.73 kN. The open 6213 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 10000 r/min, catalogue mass 1200 g.", "applications": [ "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "At 65 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Assign interference to the rotating ring: on a conventional shaft-mounted 65 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "The M suffix on 6213-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1200 g quoted mass includes the heavier cage.", "Open 6213-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6213-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 65 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 6213 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6213-M?", "a": "The SKF 6213 M measures 65 mm bore × 120 mm OD × 23 mm width (2.559 × 4.724 × 0.906 in), mass about 1200 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6213 work?", "a": "The final two digits of 6213 are bore code 13, multiplied by 5 to give 65 mm." }, { "q": "What is the speed rating of 6213-M?", "a": "SKF lists a 12000 r/min thermal reference speed and a 10000 r/min mechanical limiting speed for 6213 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6213-M and a same-bore 62-series bearing?", "a": "Section height differs: 6213-M has a 27.5 mm radial section and C 58.5 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6213-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 120 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope as SKF 213, but catalogue C/C0 differ (58.5/40.5 kN vs 60.5/58.5 kN) — envelope match only after a load check." }, { "equiv_sku": "213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope as SKF 213-2Z, but catalogue C/C0 differ (58.5/40.5 kN vs 60.5/58.5 kN) — envelope match only after a load check." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6213 (open arrangement) shares the 65×120×23 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6213-2Z (two non-contact shields) shares the 65×120×23 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6213DDU on the same 65×120×23 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6213VV on the same 65×120×23 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6213-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6213ZZ on the same 65×120×23 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6213-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6213 on the same 65×120×23 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6213-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6213 on the same 65×120×23 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6213-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6213LLU on the same 65×120×23 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6213-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6213LLB on the same 65×120×23 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6213-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6213ZZ on the same 65×120×23 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6213-M", "6213 M" ], "locale_variants": {} }, { "sku": "62213-2RS", "brand": "SKF", "manufacturer_designation": "62213-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 55.9, "static_load_kN": 40.5, "fatigue_load_limit_kN": 1.73, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62213 carries code 13 = 65 mm (code × 5). The envelope is 65×120×31 mm (2.559×4.724×1.22 in) with a 27.5 mm radial section height, C 55.9 kN, C0 40.5 kN and Pu 1.73 kN. SKF catalogues the sealed execution as 62213-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 3600 r/min, catalogue mass 1400 g.", "applications": [ "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "The fatigue load limit is 1.73 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Catalogue ratings for 62213-2RS (C 55.9 kN, C0 40.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Contact seals make 62213-2RS slower than the open 62213 (limiting 3600 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62213-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Deep-groove geometry tolerates only minutes of misalignment; if the 120 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62213-2RS.", "Do not preload 62213-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 62213-2RS?", "a": "The SKF 62213-2RS1 measures 65 mm bore × 120 mm OD × 31 mm width (2.559 × 4.724 × 1.22 in), mass about 1400 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62213 work?", "a": "The final two digits of 62213 are bore code 13, multiplied by 5 to give 65 mm." }, { "q": "What is the difference between 62213-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62213-2RS has a 27.5 mm radial section and C 55.9 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 62213-2RS?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 120 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 62213-2RS?", "a": "Catalogue mass is 1400 g for 62213-2RS1; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "4213-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope as SKF 4213 ATN9, but catalogue C/C0 differ (55.9/40.5 kN vs 67.6/67 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62213-2RS", "62213-2RS1" ], "locale_variants": {} }, { "sku": "6313-M", "brand": "SKF", "manufacturer_designation": "6313 M", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 2550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6313 carries code 13 = 65 mm (code × 5). The envelope is 65×140×33 mm (2.559×5.512×1.299 in) with a 37.5 mm radial section height, C 97.5 kN, C0 60 kN and Pu 2.5 kN. The open 6313 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 6700 r/min, catalogue mass 2550 g.", "applications": [ "material-handling equipment", "industrial fans", "compressor drives", "machine tool auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 6313-M home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 2.5 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The M suffix on 6313-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 2550 g quoted mass includes the heavier cage.", "Open 6313-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6313-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 6313-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 6313 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6313-M?", "a": "The SKF 6313 M measures 65 mm bore × 140 mm OD × 33 mm width (2.559 × 5.512 × 1.299 in), mass about 2550 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6313 work?", "a": "The final two digits of 6313 are bore code 13, multiplied by 5 to give 65 mm." }, { "q": "What is the speed rating of 6313-M?", "a": "SKF lists a 10000 r/min thermal reference speed and a 6700 r/min mechanical limiting speed for 6313 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6313-M and a same-bore 62-series bearing?", "a": "Section height differs: 6313-M has a 37.5 mm radial section and C 97.5 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6313-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 140 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "313", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope as SKF 313, but catalogue C/C0 differ (97.5/60 kN vs 102/90 kN) — envelope match only after a load check." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope as SKF 313-2Z, but catalogue C/C0 differ (97.5/60 kN vs 102/90 kN) — envelope match only after a load check." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6313 (open arrangement) shares the 65×140×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6313-2Z (two non-contact shields) shares the 65×140×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6313-2RS1 (two contact elastomer seals) shares the 65×140×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6313DDU on the same 65×140×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6313VV on the same 65×140×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6313ZZ on the same 65×140×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6313 on the same 65×140×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6313-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6313 on the same 65×140×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6313-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6313LLU on the same 65×140×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6313-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6313LLB on the same 65×140×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6313-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6313ZZ on the same 65×140×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6313-M", "6313 M" ], "locale_variants": {} }, { "sku": "62313-2RS", "brand": "SKF", "manufacturer_designation": "62313-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92.3, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 3000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62313 carries code 13 = 65 mm (code × 5). The envelope is 65×140×48 mm (2.559×5.512×1.89 in) with a 37.5 mm radial section height, C 92.3 kN, C0 60 kN and Pu 2.5 kN. SKF catalogues the sealed execution as 62313-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 3200 r/min, catalogue mass 3000 g.", "applications": [ "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 65 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Fillet radii must clear the 62313-2RS chamfer so the 48 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Contact seals make 62313-2RS slower than the open 62313 (limiting 3200 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62313-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Do not preload 62313-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 62313-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 62313-2RS?", "a": "The SKF 62313-2RS1 measures 65 mm bore × 140 mm OD × 48 mm width (2.559 × 5.512 × 1.89 in), mass about 3000 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62313 work?", "a": "The final two digits of 62313 are bore code 13, multiplied by 5 to give 65 mm." }, { "q": "How heavy is 62313-2RS?", "a": "Catalogue mass is 3000 g for 62313-2RS1; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 62313-2RS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 62313-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "4313-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×48 mm envelope as SKF 4313 ATN9, but catalogue C/C0 differ (92.3/60 kN vs 121/106 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62313-2RS", "62313-2RS1" ], "locale_variants": {} }, { "sku": "6014-M", "brand": "SKF", "manufacturer_designation": "6014 M", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "reference_speed_rpm": 13000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6014 carries code 14 = 70 mm (code × 5). The envelope is 70×110×20 mm (2.756×4.331×0.787 in) with a 20.0 mm radial section height, C 39.7 kN, C0 31 kN and Pu 1.32 kN. The open 6014 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 11000 r/min, catalogue mass 700 g.", "applications": [ "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Fillet radii must clear the 6014-M chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Do not preload 6014-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6014-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 700 g quoted mass includes the heavier cage.", "Open 6014-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6014-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 70 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "For positions that need relubrication, choose the open execution of 6014 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6014-M?", "a": "The SKF 6014 M measures 70 mm bore × 110 mm OD × 20 mm width (2.756 × 4.331 × 0.787 in), mass about 700 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6014 work?", "a": "The final two digits of 6014 are bore code 14, multiplied by 5 to give 70 mm." }, { "q": "What is the speed rating of 6014-M?", "a": "SKF lists a 13000 r/min thermal reference speed and a 11000 r/min mechanical limiting speed for 6014 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6014-M and a same-bore 62-series bearing?", "a": "Section height differs: 6014-M has a 20 mm radial section and C 39.7 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6014-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 110 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "6014", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6014 (open arrangement) shares the 70×110×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6014-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6014-2Z (two non-contact shields) shares the 70×110×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6014-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6014-2RS1 (two contact elastomer seals) shares the 70×110×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6014DDU on the same 70×110×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6014VV on the same 70×110×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6014ZZ on the same 70×110×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6014 on the same 70×110×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6014-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6014 on the same 70×110×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6014-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6014LLU on the same 70×110×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6014-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6014LLB on the same 70×110×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6014-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6014ZZ on the same 70×110×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6014-M", "6014 M" ], "locale_variants": {} }, { "sku": "6214-M", "brand": "SKF", "manufacturer_designation": "6214 M", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 60.5, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 11000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6214 carries code 14 = 70 mm (code × 5). The envelope is 70×125×24 mm (2.756×4.921×0.945 in) with a 27.5 mm radial section height, C 60.5 kN, C0 45 kN and Pu 1.9 kN. The open 6214 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 10000 r/min, catalogue mass 1300 g.", "applications": [ "compressor drives", "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 6214-M home through the outer ring or balls brinells the raceways.", "At 70 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "The M suffix on 6214-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1300 g quoted mass includes the heavier cage.", "Open 6214-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6214-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 6214-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 6214 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6214-M?", "a": "The SKF 6214 M measures 70 mm bore × 125 mm OD × 24 mm width (2.756 × 4.921 × 0.945 in), mass about 1300 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6214 work?", "a": "The final two digits of 6214 are bore code 14, multiplied by 5 to give 70 mm." }, { "q": "What is the speed rating of 6214-M?", "a": "SKF lists a 11000 r/min thermal reference speed and a 10000 r/min mechanical limiting speed for 6214 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6214-M and a same-bore 62-series bearing?", "a": "Section height differs: 6214-M has a 27.5 mm radial section and C 60.5 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6214-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 125 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope as SKF 214, but catalogue C/C0 differ (60.5/45 kN vs 66/65.5 kN) — envelope match only after a load check." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope as SKF 214-2Z, but catalogue C/C0 differ (60.5/45 kN vs 66/65.5 kN) — envelope match only after a load check." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6214 (open arrangement) shares the 70×125×24 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6214-2Z (two non-contact shields) shares the 70×125×24 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6214-2RS1 (two contact elastomer seals) shares the 70×125×24 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214DDU on the same 70×125×24 mm envelope, but catalogue C/C0 differ (60.5/45 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214VV on the same 70×125×24 mm envelope, but catalogue C/C0 differ (60.5/45 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214ZZ on the same 70×125×24 mm envelope, but catalogue C/C0 differ (60.5/45 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214 on the same 70×125×24 mm envelope, but catalogue C/C0 differ (60.5/45 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214 on the same 70×125×24 mm envelope, but catalogue C/C0 differ (60.5/45 kN vs 69/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214LLU on the same 70×125×24 mm envelope, but catalogue C/C0 differ (60.5/45 kN vs 69/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214LLB on the same 70×125×24 mm envelope, but catalogue C/C0 differ (60.5/45 kN vs 69/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214ZZ on the same 70×125×24 mm envelope, but catalogue C/C0 differ (60.5/45 kN vs 69/44 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6214-M", "6214 M" ], "locale_variants": {} }, { "sku": "62214-2RS", "brand": "SKF", "manufacturer_designation": "62214-2RS1", "series": "62200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 60.5, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62200-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62214 carries code 14 = 70 mm (code × 5). The envelope is 70×125×31 mm (2.756×4.921×1.22 in) with a 27.5 mm radial section height, C 60.5 kN, C0 45 kN and Pu 1.9 kN. SKF catalogues the sealed execution as 62214-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 3400 r/min, catalogue mass 1400 g.", "applications": [ "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "The fatigue load limit is 1.9 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Deep-groove geometry tolerates only minutes of misalignment; if the 125 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62214-2RS.", "Contact seals make 62214-2RS slower than the open 62214 (limiting 3400 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62214-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Catalogue ratings for 62214-2RS (C 60.5 kN, C0 45 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Mount by heating the inner ring (max 120 °C) — driving 62214-2RS home through the outer ring or balls brinells the raceways.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 62214 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 62214-2RS?", "a": "The SKF 62214-2RS1 measures 70 mm bore × 125 mm OD × 31 mm width (2.756 × 4.921 × 1.22 in), mass about 1400 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62214 work?", "a": "The final two digits of 62214 are bore code 14, multiplied by 5 to give 70 mm." }, { "q": "How long can a greased 62214-2RS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 62214-2RS take?", "a": "Catalogue values for 62214-2RS1: dynamic C 60.5 kN, static C0 45 kN, fatigue limit Pu 1.9 kN. Use C in life calculation and C0 for static checks at 70 mm bore." }, { "q": "What is the speed rating of 62214-2RS?", "a": "SKF publishes only the 3400 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." } ], "cross_ref": [ { "equiv_sku": "4214-ATN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope as SKF 4214 ATN9, but catalogue C/C0 differ (60.5/45 kN vs 70.2/73.5 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62214-2RS", "62214-2RS1" ], "locale_variants": {} }, { "sku": "6314-M", "brand": "SKF", "manufacturer_designation": "6314 M", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 3100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6314 carries code 14 = 70 mm (code × 5). The envelope is 70×150×35 mm (2.756×5.906×1.378 in) with a 40.0 mm radial section height, C 111 kN, C0 68 kN and Pu 2.75 kN. The open 6314 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 6300 r/min, catalogue mass 3100 g.", "applications": [ "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans", "compressor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 150 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6314-M.", "Assign interference to the rotating ring: on a conventional shaft-mounted 70 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "The M suffix on 6314-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 3100 g quoted mass includes the heavier cage.", "Open 6314-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6314-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 6314-M (C 111 kN, C0 68 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6314-M?", "a": "The SKF 6314 M measures 70 mm bore × 150 mm OD × 35 mm width (2.756 × 5.906 × 1.378 in), mass about 3100 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6314 work?", "a": "The final two digits of 6314 are bore code 14, multiplied by 5 to give 70 mm." }, { "q": "What is the difference between 6314-M and a same-bore 62-series bearing?", "a": "Section height differs: 6314-M has a 40 mm radial section and C 111 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6314-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 150 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6314-M?", "a": "Catalogue mass is 3100 g for 6314 M; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope as SKF 314, but catalogue C/C0 differ (111/68 kN vs 114/102 kN) — envelope match only after a load check." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope as SKF 314-2Z, but catalogue C/C0 differ (111/68 kN vs 114/102 kN) — envelope match only after a load check." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6314 (open arrangement) shares the 70×150×35 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6314-2Z (two non-contact shields) shares the 70×150×35 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6314-2RS1 (two contact elastomer seals) shares the 70×150×35 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6314DDU on the same 70×150×35 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6314VV on the same 70×150×35 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6314ZZ on the same 70×150×35 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6314 on the same 70×150×35 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6314-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6314 on the same 70×150×35 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6314-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6314LLU on the same 70×150×35 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6314-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6314LLB on the same 70×150×35 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6314-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6314ZZ on the same 70×150×35 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6314-M", "6314 M" ], "locale_variants": {} }, { "sku": "62314-2RS", "brand": "SKF", "manufacturer_designation": "62314-2RS1", "series": "62300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 104, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 3750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 62300-series is the wide-section counterpart of the standard deep-groove family (extra width code built into the designation); the last two digits encode the bore: 62314 carries code 14 = 70 mm (code × 5). The envelope is 70×150×51 mm (2.756×5.906×2.008 in) with a 40.0 mm radial section height, C 104 kN, C0 68 kN and Pu 2.75 kN. SKF catalogues the sealed execution as 62314-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 3000 r/min, catalogue mass 3750 g.", "applications": [ "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans", "compressor drives" ], "failure_modes": [ "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 150 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62314-2RS.", "Mount by heating the inner ring (max 120 °C) — driving 62314-2RS home through the outer ring or balls brinells the raceways.", "Contact seals make 62314-2RS slower than the open 62314 (limiting 3000 r/min) and forbid solvent washing, which destroys the lifetime grease.", "Do not pry the caps off 62314-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.", "Assign interference to the rotating ring: on a conventional shaft-mounted 70 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Deep-groove geometry tolerates only minutes of misalignment; if the 150 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 62314-2RS.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 62314 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 62314-2RS?", "a": "The SKF 62314-2RS1 measures 70 mm bore × 150 mm OD × 51 mm width (2.756 × 5.906 × 2.008 in), mass about 3750 g. It has two contact rubber seals and a lifetime grease fill." }, { "q": "How does the bore code in 62314 work?", "a": "The final two digits of 62314 are bore code 14, multiplied by 5 to give 70 mm." }, { "q": "What load can 62314-2RS take?", "a": "Catalogue values for 62314-2RS1: dynamic C 104 kN, static C0 68 kN, fatigue limit Pu 2.75 kN. Use C in life calculation and C0 for static checks at 70 mm bore." }, { "q": "What is the speed rating of 62314-2RS?", "a": "SKF publishes only the 3000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern." }, { "q": "What is the difference between 62314-2RS and a same-bore 62-series bearing?", "a": "Section height differs: 62314-2RS has a 40 mm radial section and C 104 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "62314-2RS", "62314-2RS1" ], "locale_variants": {} }, { "sku": "6015-M", "brand": "SKF", "manufacturer_designation": "6015 M", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 740, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6015 carries code 15 = 75 mm (code × 5). The envelope is 75×115×20 mm (2.953×4.528×0.787 in) with a 20.0 mm radial section height, C 41.6 kN, C0 33.5 kN and Pu 1.43 kN. The open 6015 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 10000 r/min, catalogue mass 740 g.", "applications": [ "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 115 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6015-M.", "Do not preload 6015-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6015-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 740 g quoted mass includes the heavier cage.", "Open 6015-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6015-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 6015-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6015-M?", "a": "The SKF 6015 M measures 75 mm bore × 115 mm OD × 20 mm width (2.953 × 4.528 × 0.787 in), mass about 740 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6015 work?", "a": "The final two digits of 6015 are bore code 15, multiplied by 5 to give 75 mm." }, { "q": "How long can a greased 6015-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6015-M take?", "a": "Catalogue values for 6015 M: dynamic C 41.6 kN, static C0 33.5 kN, fatigue limit Pu 1.43 kN. Use C in life calculation and C0 for static checks at 75 mm bore." }, { "q": "What is the speed rating of 6015-M?", "a": "SKF lists a 12000 r/min thermal reference speed and a 10000 r/min mechanical limiting speed for 6015 M; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "6015", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6015 (open arrangement) shares the 75×115×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6015-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6015-2Z (two non-contact shields) shares the 75×115×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6015-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6015-2RS1 (two contact elastomer seals) shares the 75×115×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6015-RSR", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6015-2RZ (low-friction non-contact seals) shares the 75×115×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6015DDU on the same 75×115×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6015VV on the same 75×115×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6015ZZ on the same 75×115×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6015 on the same 75×115×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6015-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6015 on the same 75×115×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6015-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6015LLU on the same 75×115×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6015-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6015LLB on the same 75×115×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6015-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6015ZZ on the same 75×115×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6015-M", "6015 M" ], "locale_variants": {} }, { "sku": "6215-M", "brand": "SKF", "manufacturer_designation": "6215 M", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 10000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6215 carries code 15 = 75 mm (code × 5). The envelope is 75×130×25 mm (2.953×5.118×0.984 in) with a 27.5 mm radial section height, C 68.9 kN, C0 49 kN and Pu 2.04 kN. The open 6215 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 9500 r/min, catalogue mass 1400 g.", "applications": [ "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Catalogue ratings for 6215-M (C 68.9 kN, C0 49 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Deep-groove geometry tolerates only minutes of misalignment; if the 130 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6215-M.", "The M suffix on 6215-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1400 g quoted mass includes the heavier cage.", "Open 6215-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6215-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 75 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "A replacement 6215 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6215-M?", "a": "The SKF 6215 M measures 75 mm bore × 130 mm OD × 25 mm width (2.953 × 5.118 × 0.984 in), mass about 1400 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6215 work?", "a": "The final two digits of 6215 are bore code 15, multiplied by 5 to give 75 mm." }, { "q": "What is the speed rating of 6215-M?", "a": "SKF lists a 10000 r/min thermal reference speed and a 9500 r/min mechanical limiting speed for 6215 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6215-M and a same-bore 62-series bearing?", "a": "Section height differs: 6215-M has a 27.5 mm radial section and C 68.9 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6215-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 130 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope as SKF 215, but catalogue C/C0 differ (68.9/49 kN vs 72.1/72 kN) — envelope match only after a load check." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope as SKF 215-2Z, but catalogue C/C0 differ (68.9/49 kN vs 72.1/72 kN) — envelope match only after a load check." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6215 (open arrangement) shares the 75×130×25 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6215-2Z (two non-contact shields) shares the 75×130×25 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6215-2RS1 (two contact elastomer seals) shares the 75×130×25 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6215DDU on the same 75×130×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6215VV on the same 75×130×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6215ZZ on the same 75×130×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6215 on the same 75×130×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6215-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6215 on the same 75×130×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6215-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6215LLU on the same 75×130×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6215-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6215LLB on the same 75×130×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6215-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6215ZZ on the same 75×130×25 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6215-M", "6215 M" ], "locale_variants": {} }, { "sku": "6315-M", "brand": "SKF", "manufacturer_designation": "6315 M", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6315 carries code 15 = 75 mm (code × 5). The envelope is 75×160×37 mm (2.953×6.299×1.457 in) with a 42.5 mm radial section height, C 119 kN, C0 76.5 kN and Pu 3 kN. The open 6315 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5600 r/min, catalogue mass 3700 g.", "applications": [ "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 75 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6315-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The M suffix on 6315-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 3700 g quoted mass includes the heavier cage.", "Open 6315-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6315-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 6315-M (C 119 kN, C0 76.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "For positions that need relubrication, choose the open execution of 6315 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6315-M?", "a": "The SKF 6315 M measures 75 mm bore × 160 mm OD × 37 mm width (2.953 × 6.299 × 1.457 in), mass about 3700 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6315 work?", "a": "The final two digits of 6315 are bore code 15, multiplied by 5 to give 75 mm." }, { "q": "What load can 6315-M take?", "a": "Catalogue values for 6315 M: dynamic C 119 kN, static C0 76.5 kN, fatigue limit Pu 3 kN. Use C in life calculation and C0 for static checks at 75 mm bore." }, { "q": "What is the speed rating of 6315-M?", "a": "SKF lists a 9000 r/min thermal reference speed and a 5600 r/min mechanical limiting speed for 6315 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6315-M and a same-bore 62-series bearing?", "a": "Section height differs: 6315-M has a 42.5 mm radial section and C 119 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope as SKF 315, but catalogue C/C0 differ (119/76.5 kN vs 125/116 kN) — envelope match only after a load check." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope as SKF 315-2Z, but catalogue C/C0 differ (119/76.5 kN vs 125/116 kN) — envelope match only after a load check." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6315 (open arrangement) shares the 75×160×37 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6315-2Z (two non-contact shields) shares the 75×160×37 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6315-2RS1 (two contact elastomer seals) shares the 75×160×37 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6315DDU on the same 75×160×37 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6315VV on the same 75×160×37 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6315ZZ on the same 75×160×37 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6315 on the same 75×160×37 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6315-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6315 on the same 75×160×37 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6315-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6315LLU on the same 75×160×37 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6315-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6315LLB on the same 75×160×37 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6315-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6315ZZ on the same 75×160×37 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6315-M", "6315 M" ], "locale_variants": {} }, { "sku": "6216-M", "brand": "SKF", "manufacturer_designation": "6216 M", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 9500, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 1700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6216 carries code 16 = 80 mm (code × 5). The envelope is 80×140×26 mm (3.15×5.512×1.024 in) with a 30.0 mm radial section height, C 72.8 kN, C0 55 kN and Pu 2.2 kN. The open 6216 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 8500 r/min, catalogue mass 1700 g.", "applications": [ "material-handling equipment", "industrial fans", "compressor drives", "machine tool auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "The fatigue load limit is 2.2 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Catalogue ratings for 6216-M (C 72.8 kN, C0 55 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "The M suffix on 6216-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1700 g quoted mass includes the heavier cage.", "Open 6216-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6216-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 6216-M chamfer so the 26 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 6216 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Where two 6216 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6216-M?", "a": "The SKF 6216 M measures 80 mm bore × 140 mm OD × 26 mm width (3.15 × 5.512 × 1.024 in), mass about 1700 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6216 work?", "a": "The final two digits of 6216 are bore code 16, multiplied by 5 to give 80 mm." }, { "q": "How long can a greased 6216-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6216-M take?", "a": "Catalogue values for 6216 M: dynamic C 72.8 kN, static C0 55 kN, fatigue limit Pu 2.2 kN. Use C in life calculation and C0 for static checks at 80 mm bore." }, { "q": "What is the speed rating of 6216-M?", "a": "SKF lists a 9500 r/min thermal reference speed and a 8500 r/min mechanical limiting speed for 6216 M; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope as SKF 216, but catalogue C/C0 differ (72.8/55 kN vs 88/85 kN) — envelope match only after a load check." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope as SKF 216-2Z, but catalogue C/C0 differ (72.8/55 kN vs 88/85 kN) — envelope match only after a load check." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6216 (open arrangement) shares the 80×140×26 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6216-2Z (two non-contact shields) shares the 80×140×26 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6216-2RS1 (two contact elastomer seals) shares the 80×140×26 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6216DDU on the same 80×140×26 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6216VV on the same 80×140×26 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6216ZZ on the same 80×140×26 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6216 on the same 80×140×26 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6216-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216 on the same 80×140×26 mm envelope, but catalogue C/C0 differ (72.8/55 kN vs 80.5/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216LLU on the same 80×140×26 mm envelope, but catalogue C/C0 differ (72.8/55 kN vs 80.5/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216LLB on the same 80×140×26 mm envelope, but catalogue C/C0 differ (72.8/55 kN vs 80.5/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216ZZ on the same 80×140×26 mm envelope, but catalogue C/C0 differ (72.8/55 kN vs 80.5/53 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "6216-M", "6216 M" ], "locale_variants": {} } ]